ARM: dts: stm32: Fix typo in stm32h7-u-boot.dtsi

Fix typo "firsct"

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/dts/stm32h7-u-boot.dtsi b/arch/arm/dts/stm32h7-u-boot.dtsi
index 7182533..54dd406 100644
--- a/arch/arm/dts/stm32h7-u-boot.dtsi
+++ b/arch/arm/dts/stm32h7-u-boot.dtsi
@@ -39,7 +39,7 @@
 
 			/*
 			 * Memory configuration from sdram datasheet IS42S32800G-6BLI
-			 * firsct bank is bank@0
+			 * first bank is bank@0
 			 * second bank is bank@1
 			 */
 			bank1: bank@1 {