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/board/engicam/stm32mp1/spl.c b/board/engicam/stm32mp1/spl.c
index 79adb5f..3aa738b 100644
--- a/board/engicam/stm32mp1/spl.c
+++ b/board/engicam/stm32mp1/spl.c
@@ -13,7 +13,7 @@
 
 void board_vddcore_init(u32 voltage_mv)
 {
-	if (IS_ENABLED(CONFIG_PMIC_STPMIC1) && CONFIG_IS_ENABLED(POWER_SUPPORT))
+	if (IS_ENABLED(CONFIG_PMIC_STPMIC1) && CONFIG_IS_ENABLED(POWER))
 		opp_voltage_mv = voltage_mv;
 }