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/tinker-s-rk3288_defconfig b/configs/tinker-s-rk3288_defconfig
index a4c1ff4..c5894ea 100644
--- a/configs/tinker-s-rk3288_defconfig
+++ b/configs/tinker-s-rk3288_defconfig
@@ -20,7 +20,7 @@
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN=0x300000
 CONFIG_SPL_I2C_SUPPORT=y
-CONFIG_SPL_POWER_SUPPORT=y
+CONFIG_SPL_POWER=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y