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/power/Makefile b/drivers/power/Makefile
index 5a98719..3f4d56f 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -3,8 +3,8 @@
 # Copyright (c) 2009 Wind River Systems, Inc.
 # Tom Rix <Tom.Rix at windriver.com>
 
-obj-$(CONFIG_$(SPL_TPL_)ACPI_PMC) += acpi_pmc/
-obj-$(CONFIG_$(SPL_TPL_)POWER_DOMAIN) += domain/
+obj-$(CONFIG_$(PHASE_)ACPI_PMC) += acpi_pmc/
+obj-$(CONFIG_$(PHASE_)POWER_DOMAIN) += domain/
 obj-y += pmic/
 obj-y += regulator/
 
@@ -23,9 +23,9 @@
 obj-$(CONFIG_TPS6586X_POWER)	+= tps6586x.o
 obj-$(CONFIG_TWL4030_POWER)	+= twl4030.o
 obj-$(CONFIG_PALMAS_POWER)	+= palmas.o
-obj-$(CONFIG_$(SPL_TPL_)POWER_LEGACY) += power_core.o
+obj-$(CONFIG_$(PHASE_)POWER_LEGACY) += power_core.o
 obj-$(CONFIG_DIALOG_POWER) += power_dialog.o
 obj-$(CONFIG_POWER_FSL) += power_fsl.o
-obj-$(CONFIG_$(SPL_TPL_)POWER_I2C) += power_i2c.o
+obj-$(CONFIG_$(PHASE_)POWER_I2C) += power_i2c.o
 obj-$(CONFIG_POWER_SPI) += power_spi.o
 obj-$(CONFIG_POWER_MT6323) += mt6323.o
diff --git a/drivers/power/acpi_pmc/Makefile b/drivers/power/acpi_pmc/Makefile
index 0db52a6..3259b39 100644
--- a/drivers/power/acpi_pmc/Makefile
+++ b/drivers/power/acpi_pmc/Makefile
@@ -3,4 +3,4 @@
 # Copyright 2019 Google LLC
 
 obj-y += acpi-pmc-uclass.o
-obj-$(CONFIG_$(SPL_TPL_)ACPI_PMC_SANDBOX) += sandbox.o pmc_emul.o
+obj-$(CONFIG_$(PHASE_)ACPI_PMC_SANDBOX) += sandbox.o pmc_emul.o
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 48f7dd4..bc138f5 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -3,7 +3,7 @@
 # Copyright (C) 2012 Samsung Electronics
 # Lukasz Majewski <l.majewski@samsung.com>
 
-obj-$(CONFIG_$(SPL_TPL_)DM_PMIC) += pmic-uclass.o
+obj-$(CONFIG_$(PHASE_)DM_PMIC) += pmic-uclass.o
 obj-$(CONFIG_$(XPL_)DM_PMIC_FAN53555) += fan53555.o
 obj-$(CONFIG_$(XPL_)DM_PMIC_DA9063) += da9063.o
 obj-$(CONFIG_$(XPL_)DM_PMIC_MAX77663) += max77663.o
@@ -22,7 +22,7 @@
 obj-$(CONFIG_$(XPL_)PMIC_AXP) += axp.o
 obj-$(CONFIG_PMIC_MAX8997) += max8997.o
 obj-$(CONFIG_PMIC_QCOM) += pmic_qcom.o
-obj-$(CONFIG_$(SPL_TPL_)PMIC_RK8XX) += rk8xx.o
+obj-$(CONFIG_$(PHASE_)PMIC_RK8XX) += rk8xx.o
 obj-$(CONFIG_$(XPL_)PMIC_RN5T567) += rn5t567.o
 obj-$(CONFIG_PMIC_TPS65090) += tps65090.o
 obj-$(CONFIG_PMIC_S5M8767) += s5m8767.o
diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index cac02aa..ca6c89d 100644
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -22,7 +22,7 @@
 obj-$(CONFIG_$(XPL_)DM_REGULATOR_FIXED) += fixed.o
 obj-$(CONFIG_$(XPL_)DM_REGULATOR_GPIO) += gpio-regulator.o
 obj-$(CONFIG_DM_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
-obj-$(CONFIG_$(SPL_TPL_)REGULATOR_RK8XX) += rk8xx.o
+obj-$(CONFIG_$(PHASE_)REGULATOR_RK8XX) += rk8xx.o
 obj-$(CONFIG_DM_REGULATOR_S2MPS11) += s2mps11_regulator.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 obj-$(CONFIG_DM_REGULATOR_SANDBOX) += sandbox.o