global: Rename SPL_ to XPL_

Use XPL_ as the symbol to indicate an SPL build. This means that SPL_ is
no-longer set.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 51ef51f..794c2a2 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -18,7 +18,7 @@
 obj-$(CONFIG_SANDBOX) += swap_case.o
 endif
 
-ifdef CONFIG_$(SPL_)DM_I2C
+ifdef CONFIG_$(XPL_)DM_I2C
 ifndef CONFIG_XPL_BUILD
 obj-$(CONFIG_SANDBOX) += i2c_eeprom_emul.o
 obj-$(CONFIG_USB_HUB_USB251XB) += usb251xb.o
@@ -37,14 +37,14 @@
 obj-$(CONFIG_FSL_IFC) += fsl_ifc.o
 obj-$(CONFIG_FSL_IIM) += fsl_iim.o
 obj-$(CONFIG_FSL_SEC_MON) += fsl_sec_mon.o
-obj-$(CONFIG_$(SPL_)FS_LOADER) += fs_loader.o
+obj-$(CONFIG_$(XPL_)FS_LOADER) += fs_loader.o
 obj-$(CONFIG_GATEWORKS_SC) += gsc.o
 obj-$(CONFIG_GDSYS_IOEP) += gdsys_ioep.o
 obj-$(CONFIG_GDSYS_RXAUI_CTRL) += gdsys_rxaui_ctrl.o
 obj-$(CONFIG_GDSYS_SOC) += gdsys_soc.o
 obj-$(CONFIG_IRQ) += irq-uclass.o
 obj-$(CONFIG_SANDBOX) += irq_sandbox.o irq_sandbox_test.o
-obj-$(CONFIG_$(SPL_)I2C_EEPROM) += i2c_eeprom.o
+obj-$(CONFIG_$(XPL_)I2C_EEPROM) += i2c_eeprom.o
 obj-$(CONFIG_IHS_FPGA) += ihs_fpga.o
 obj-$(CONFIG_IMX8) += imx8/
 obj-$(CONFIG_IMX_ELE) += imx_ele/
@@ -52,14 +52,14 @@
 obj-$(CONFIG_LED_STATUS_GPIO) += gpio_led.o
 obj-$(CONFIG_MPC83XX_SERDES) += mpc83xx_serdes.o
 obj-$(CONFIG_$(SPL_TPL_)LS2_SFP) += ls2_sfp.o
-obj-$(CONFIG_$(SPL_)MXC_OCOTP) += mxc_ocotp.o
+obj-$(CONFIG_$(XPL_)MXC_OCOTP) += mxc_ocotp.o
 obj-$(CONFIG_MXS_OCOTP) += mxs_ocotp.o
 obj-$(CONFIG_NPCM_OTP) += npcm_otp.o
 obj-$(CONFIG_NPCM_HOST) += npcm_host_intf.o
 obj-$(CONFIG_NUVOTON_NCT6102D) += nuvoton_nct6102d.o
 obj-$(CONFIG_P2SB) += p2sb-uclass.o
 obj-$(CONFIG_PCA9551_LED) += pca9551_led.o
-obj-$(CONFIG_$(SPL_)PWRSEQ) += pwrseq-uclass.o
+obj-$(CONFIG_$(XPL_)PWRSEQ) += pwrseq-uclass.o
 ifdef CONFIG_QFW
 obj-y += qfw.o
 obj-$(CONFIG_QFW_ACPI) += qfw_acpi.o