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/common/spl/Kconfig b/common/spl/Kconfig
index c018352..56c515b 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -1034,7 +1034,7 @@
 	  by using the generic reset API provided by driver model.
 	  This enables the drivers in drivers/reset as part of an SPL build.
 
-config SPL_POWER_SUPPORT
+config SPL_POWER
 	bool "Support power drivers"
 	help
 	  Enable support for power control in SPL. This includes support