board: stm32mp1: correct CONFIG_IS_ENABLED usage for LED

Use the correct macro to test presence CONFIG_LED:
replace CONFIG_IS_ENABLED(CONFIG_LED) by CONFIG_IS_ENABLED(LED)

Issue see during review unrelated patch
"board: stm32mp1: update management of boot-led"
http://patchwork.ozlabs.org/patch/1264823/

Cc: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/board/dhelectronics/dh_stm32mp1/board.c b/board/dhelectronics/dh_stm32mp1/board.c
index bad585c..3225581 100644
--- a/board/dhelectronics/dh_stm32mp1/board.c
+++ b/board/dhelectronics/dh_stm32mp1/board.c
@@ -450,7 +450,7 @@
 
 	board_init_fmc2();
 
-	if (CONFIG_IS_ENABLED(CONFIG_LED))
+	if (CONFIG_IS_ENABLED(LED))
 		led_default_state();
 
 	return 0;
diff --git a/board/st/stm32mp1/stm32mp1.c b/board/st/stm32mp1/stm32mp1.c
index 6c88402..45068b1 100644
--- a/board/st/stm32mp1/stm32mp1.c
+++ b/board/st/stm32mp1/stm32mp1.c
@@ -647,7 +647,7 @@
 
 	sysconf_init();
 
-	if (CONFIG_IS_ENABLED(CONFIG_LED))
+	if (CONFIG_IS_ENABLED(LED))
 		led_default_state();
 
 	return 0;