rtc: Rename RTC_SUPPORT to RTC

Rename these options so that CONFIG_IS_ENABLED can be used with them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/chromebook_link64_defconfig b/configs/chromebook_link64_defconfig
index 10d4fd1..147cf68 100644
--- a/configs/chromebook_link64_defconfig
+++ b/configs/chromebook_link64_defconfig
@@ -38,7 +38,7 @@
 CONFIG_SPL_NET_SUPPORT=y
 CONFIG_SPL_PCI=y
 CONFIG_SPL_PCH=y
-CONFIG_SPL_RTC_SUPPORT=y
+CONFIG_SPL_RTC=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_CPU=y
 CONFIG_CMD_GPIO=y
diff --git a/configs/openpiton_riscv64_spl_defconfig b/configs/openpiton_riscv64_spl_defconfig
index 67fbcdd..5107e87 100644
--- a/configs/openpiton_riscv64_spl_defconfig
+++ b/configs/openpiton_riscv64_spl_defconfig
@@ -25,7 +25,7 @@
 # CONFIG_SPL_BANNER_PRINT is not set
 CONFIG_SPL_CPU=y
 CONFIG_SPL_FS_EXT4=y
-CONFIG_SPL_RTC_SUPPORT=y
+CONFIG_SPL_RTC=y
 CONFIG_SYS_PROMPT="openpiton$ "
 # CONFIG_CMD_CPU is not set
 CONFIG_CMD_BOOTZ=y
diff --git a/configs/qemu-x86_64_defconfig b/configs/qemu-x86_64_defconfig
index 62016e9..ae94e19 100644
--- a/configs/qemu-x86_64_defconfig
+++ b/configs/qemu-x86_64_defconfig
@@ -37,7 +37,7 @@
 CONFIG_SPL_NET_SUPPORT=y
 CONFIG_SPL_PCI=y
 CONFIG_SPL_PCH=y
-CONFIG_SPL_RTC_SUPPORT=y
+CONFIG_SPL_RTC=y
 CONFIG_CMD_CPU=y
 CONFIG_CMD_BOOTEFI_SELFTEST=y
 CONFIG_CMD_NVEDIT_EFI=y
diff --git a/configs/sandbox_noinst_defconfig b/configs/sandbox_noinst_defconfig
index 68afab6..646b532 100644
--- a/configs/sandbox_noinst_defconfig
+++ b/configs/sandbox_noinst_defconfig
@@ -33,7 +33,7 @@
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_ENV_SUPPORT=y
 CONFIG_SPL_I2C=y
-CONFIG_SPL_RTC_SUPPORT=y
+CONFIG_SPL_RTC=y
 CONFIG_CMD_CPU=y
 CONFIG_CMD_LICENSE=y
 CONFIG_CMD_BOOTZ=y
diff --git a/configs/sandbox_spl_defconfig b/configs/sandbox_spl_defconfig
index cd3aa87..4c02d91 100644
--- a/configs/sandbox_spl_defconfig
+++ b/configs/sandbox_spl_defconfig
@@ -34,7 +34,7 @@
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_ENV_SUPPORT=y
 CONFIG_SPL_I2C=y
-CONFIG_SPL_RTC_SUPPORT=y
+CONFIG_SPL_RTC=y
 CONFIG_CMD_CPU=y
 CONFIG_CMD_LICENSE=y
 CONFIG_CMD_BOOTZ=y