global: Rename SPL_TPL_ to PHASE_

Use PHASE_ as the symbol to select a particular XPL build. This means
that SPL_TPL_ is no-longer set.

Update the comment in bootstage to refer to this symbol, instead of
SPL_

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/Makefile b/drivers/Makefile
index b44570f..9440af1 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -1,43 +1,43 @@
 # SPDX-License-Identifier: GPL-2.0+
 
-obj-$(CONFIG_$(SPL_TPL_)ADC) += adc/
-obj-$(CONFIG_$(SPL_TPL_)BIOSEMU) += bios_emulator/
-obj-$(CONFIG_$(SPL_TPL_)BLK) += block/
-obj-$(CONFIG_$(SPL_TPL_)BOOTCOUNT_LIMIT) += bootcount/
-obj-$(CONFIG_$(SPL_TPL_)BUTTON) += button/
-obj-$(CONFIG_$(SPL_TPL_)CACHE) += cache/
-obj-$(CONFIG_$(SPL_TPL_)CLK) += clk/
-obj-$(CONFIG_$(SPL_TPL_)DM) += core/
-obj-$(CONFIG_$(SPL_TPL_)DMA) += dma/
-obj-$(CONFIG_$(SPL_TPL_)DMA_LEGACY) += dma/
-obj-$(CONFIG_$(SPL_TPL_)DFU) += dfu/
-obj-$(CONFIG_$(SPL_TPL_)EXTCON) += extcon/
-obj-$(CONFIG_$(SPL_TPL_)GPIO) += gpio/
-obj-$(CONFIG_$(SPL_TPL_)DRIVERS_MISC) += misc/
-obj-$(CONFIG_$(SPL_TPL_)SYSRESET) += sysreset/
-obj-$(CONFIG_$(SPL_TPL_)FIRMWARE) +=firmware/
-obj-$(CONFIG_$(SPL_TPL_)I2C) += i2c/
-obj-$(CONFIG_$(SPL_TPL_)INPUT) += input/
-obj-$(CONFIG_$(SPL_TPL_)LED) += led/
-obj-$(CONFIG_$(SPL_TPL_)MMC) += mmc/
+obj-$(CONFIG_$(PHASE_)ADC) += adc/
+obj-$(CONFIG_$(PHASE_)BIOSEMU) += bios_emulator/
+obj-$(CONFIG_$(PHASE_)BLK) += block/
+obj-$(CONFIG_$(PHASE_)BOOTCOUNT_LIMIT) += bootcount/
+obj-$(CONFIG_$(PHASE_)BUTTON) += button/
+obj-$(CONFIG_$(PHASE_)CACHE) += cache/
+obj-$(CONFIG_$(PHASE_)CLK) += clk/
+obj-$(CONFIG_$(PHASE_)DM) += core/
+obj-$(CONFIG_$(PHASE_)DMA) += dma/
+obj-$(CONFIG_$(PHASE_)DMA_LEGACY) += dma/
+obj-$(CONFIG_$(PHASE_)DFU) += dfu/
+obj-$(CONFIG_$(PHASE_)EXTCON) += extcon/
+obj-$(CONFIG_$(PHASE_)GPIO) += gpio/
+obj-$(CONFIG_$(PHASE_)DRIVERS_MISC) += misc/
+obj-$(CONFIG_$(PHASE_)SYSRESET) += sysreset/
+obj-$(CONFIG_$(PHASE_)FIRMWARE) +=firmware/
+obj-$(CONFIG_$(PHASE_)I2C) += i2c/
+obj-$(CONFIG_$(PHASE_)INPUT) += input/
+obj-$(CONFIG_$(PHASE_)LED) += led/
+obj-$(CONFIG_$(PHASE_)MMC) += mmc/
 obj-y += mtd/
-obj-$(CONFIG_$(SPL_TPL_)ETH) += net/
-obj-$(CONFIG_$(SPL_TPL_)PCH) += pch/
-obj-$(CONFIG_$(SPL_TPL_)PCI) += pci/
-obj-$(CONFIG_$(SPL_TPL_)PHY) += phy/
-obj-$(CONFIG_$(SPL_TPL_)PINCTRL) += pinctrl/
-obj-$(CONFIG_$(SPL_TPL_)POWER) += power/
-obj-$(CONFIG_$(SPL_TPL_)RAM) += ram/
-obj-$(CONFIG_$(SPL_TPL_)RTC) += rtc/
-obj-$(CONFIG_$(SPL_TPL_)SERIAL) += serial/
-obj-$(CONFIG_$(SPL_TPL_)SPI) += spi/
-obj-$(CONFIG_$(SPL_TPL_)TIMER) += timer/
-obj-$(CONFIG_$(SPL_TPL_)VIRTIO) += virtio/
+obj-$(CONFIG_$(PHASE_)ETH) += net/
+obj-$(CONFIG_$(PHASE_)PCH) += pch/
+obj-$(CONFIG_$(PHASE_)PCI) += pci/
+obj-$(CONFIG_$(PHASE_)PHY) += phy/
+obj-$(CONFIG_$(PHASE_)PINCTRL) += pinctrl/
+obj-$(CONFIG_$(PHASE_)POWER) += power/
+obj-$(CONFIG_$(PHASE_)RAM) += ram/
+obj-$(CONFIG_$(PHASE_)RTC) += rtc/
+obj-$(CONFIG_$(PHASE_)SERIAL) += serial/
+obj-$(CONFIG_$(PHASE_)SPI) += spi/
+obj-$(CONFIG_$(PHASE_)TIMER) += timer/
+obj-$(CONFIG_$(PHASE_)VIRTIO) += virtio/
 obj-$(CONFIG_$(XPL_)DM_MAILBOX) += mailbox/
 obj-$(CONFIG_$(XPL_)REMOTEPROC) += remoteproc/
 obj-$(CONFIG_$(XPL_)SYSINFO) += sysinfo/
-obj-$(CONFIG_$(SPL_TPL_)SM) += sm/
-obj-$(CONFIG_$(SPL_TPL_)TPM) += tpm/
+obj-$(CONFIG_$(PHASE_)SM) += sm/
+obj-$(CONFIG_$(PHASE_)TPM) += tpm/
 obj-$(CONFIG_$(XPL_)NVME) += nvme/
 obj-$(CONFIG_XEN) += xen/
 obj-$(CONFIG_$(XPL_)FPGA) += fpga/
@@ -126,7 +126,7 @@
 obj-$(CONFIG_MACH_PIC32) += ddr/microchip/
 obj-$(CONFIG_FUZZ) += fuzz/
 obj-$(CONFIG_DM_HWSPINLOCK) += hwspinlock/
-obj-$(CONFIG_$(SPL_TPL_)DM_RNG) += rng/
+obj-$(CONFIG_$(PHASE_)DM_RNG) += rng/
 endif
 
 obj-y += soc/