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/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index 17942e2..9057703 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -18,7 +18,7 @@
 
 config SPL_DM_REGULATOR
 	bool "Enable regulators for SPL"
-	depends on DM_REGULATOR && SPL_POWER_SUPPORT
+	depends on DM_REGULATOR && SPL_POWER
 	---help---
 	Regulators are seldom needed in SPL. Even if they are accessed, some
 	code space can be saved by accessing the PMIC registers directly.