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/lib/Makefile b/lib/Makefile
index 139476a..7ccc91f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -20,7 +20,7 @@
 
 obj-$(CONFIG_AES) += aes.o
 obj-$(CONFIG_AES) += aes/
-obj-$(CONFIG_$(SPL_TPL_)BINMAN_FDT) += binman.o
+obj-$(CONFIG_$(PHASE_)BINMAN_FDT) += binman.o
 
 ifndef API_BUILD
 ifneq ($(CONFIG_CHARSET),)
@@ -56,8 +56,8 @@
 obj-y += list_sort.o
 endif
 
-obj-$(CONFIG_$(SPL_TPL_)TPM) += tpm-common.o
-ifeq ($(CONFIG_$(SPL_TPL_)TPM),y)
+obj-$(CONFIG_$(PHASE_)TPM) += tpm-common.o
+ifeq ($(CONFIG_$(PHASE_)TPM),y)
 obj-$(CONFIG_TPM) += tpm_api.o
 obj-$(CONFIG_TPM_V1) += tpm-v1.o
 obj-$(CONFIG_TPM_V2) += tpm-v2.o
@@ -65,12 +65,12 @@
 obj-$(CONFIG_MEASURED_BOOT) += tpm_tcg2.o
 endif
 
-obj-$(CONFIG_$(SPL_TPL_)CRC8) += crc8.o
-obj-$(CONFIG_$(SPL_TPL_)CRC16) += crc16.o
+obj-$(CONFIG_$(PHASE_)CRC8) += crc8.o
+obj-$(CONFIG_$(PHASE_)CRC16) += crc16.o
 
 obj-y += crypto/
 
-obj-$(CONFIG_$(SPL_TPL_)ACPI) += acpi/
+obj-$(CONFIG_$(PHASE_)ACPI) += acpi/
 obj-$(CONFIG_$(XPL_)MD5) += md5.o
 obj-$(CONFIG_ECDSA) += ecdsa/
 obj-$(CONFIG_$(XPL_)RSA) += rsa/
@@ -93,12 +93,12 @@
 
 obj-$(CONFIG_LIBAVB) += libavb/
 
-obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += libfdt/
-obj-$(CONFIG_$(SPL_TPL_)OF_REAL) += fdtdec_common.o fdtdec.o
+obj-$(CONFIG_$(PHASE_)OF_LIBFDT) += libfdt/
+obj-$(CONFIG_$(PHASE_)OF_REAL) += fdtdec_common.o fdtdec.o
 
 ifdef CONFIG_XPL_BUILD
 obj-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16-ccitt.o
-obj-$(CONFIG_$(SPL_TPL_)HASH) += crc16-ccitt.o
+obj-$(CONFIG_$(PHASE_)HASH) += crc16-ccitt.o
 obj-$(CONFIG_MMC_SPI_CRC_ON) += crc16-ccitt.o
 obj-y += net_utils.o
 endif
@@ -110,15 +110,15 @@
 CFLAGS_display_options.o := $(if $(BUILD_TAG),-DBUILD_TAG='"$(BUILD_TAG)"')
 obj-$(CONFIG_BCH) += bch.o
 obj-$(CONFIG_MMC_SPI) += crc7.o
-obj-$(CONFIG_$(SPL_TPL_)CRC32) += crc32.o
+obj-$(CONFIG_$(PHASE_)CRC32) += crc32.o
 obj-$(CONFIG_CRC32C) += crc32c.o
 obj-y += ctype.o
 obj-y += div64.o
-obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += fdtdec.o fdtdec_common.o
+obj-$(CONFIG_$(PHASE_)OF_LIBFDT) += fdtdec.o fdtdec_common.o
 obj-y += hang.o
 obj-y += linux_compat.o
 obj-y += linux_string.o
-obj-$(CONFIG_$(SPL_TPL_)LMB) += lmb.o
+obj-$(CONFIG_$(PHASE_)LMB) += lmb.o
 obj-y += membuff.o
 obj-$(CONFIG_REGEX) += slre.o
 obj-y += string.o
@@ -133,12 +133,12 @@
 
 ifeq ($(CONFIG_XPL_BUILD),y)
 # SPL U-Boot may use full-printf, tiny-printf or none at all
-ifdef CONFIG_$(SPL_TPL_)USE_TINY_PRINTF
-obj-$(CONFIG_$(SPL_TPL_)SPRINTF) += tiny-printf.o
+ifdef CONFIG_$(PHASE_)USE_TINY_PRINTF
+obj-$(CONFIG_$(PHASE_)SPRINTF) += tiny-printf.o
 else
-obj-$(CONFIG_$(SPL_TPL_)SPRINTF) += vsprintf.o
+obj-$(CONFIG_$(PHASE_)SPRINTF) += vsprintf.o
 endif
-obj-$(CONFIG_$(SPL_TPL_)STRTO) += strto.o
+obj-$(CONFIG_$(PHASE_)STRTO) += strto.o
 else
 # Main U-Boot always uses the full printf support
 obj-y += vsprintf.o strto.o
@@ -152,7 +152,7 @@
 obj-y += rtc-lib.o
 obj-$(CONFIG_LIB_ELF) += elf.o
 
-obj-$(CONFIG_$(SPL_TPL_)SEMIHOSTING) += semihosting.o
+obj-$(CONFIG_$(PHASE_)SEMIHOSTING) += semihosting.o
 
 #
 # Build a fast OID lookup registry from include/linux/oid_registry.h