Rename SPL_POWER_SUPPORT to SPL_POWER

Rename this option so that CONFIG_IS_ENABLED can be used with it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/configs/brsmarc1_defconfig b/configs/brsmarc1_defconfig
index 830cd44..679976d 100644
--- a/configs/brsmarc1_defconfig
+++ b/configs/brsmarc1_defconfig
@@ -40,7 +40,7 @@
 CONFIG_SPL_I2C_SUPPORT=y
 # CONFIG_SPL_NAND_SUPPORT is not set
 CONFIG_SPL_DM_SPI_FLASH=y
-CONFIG_SPL_POWER_SUPPORT=y
+CONFIG_SPL_POWER=y
 CONFIG_SPL_SPI_LOAD=y
 CONFIG_SPL_YMODEM_SUPPORT=y
 CONFIG_HUSH_PARSER=y