arm: Rename STM32MP13x

CONFIG options must not use lower-case letter. Convert this and related
ones to upper case.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Igor Opaniuk <igor.opaniuk@foundries.io>
diff --git a/arch/arm/mach-stm32mp/Makefile b/arch/arm/mach-stm32mp/Makefile
index fdcbbf9..3d194de 100644
--- a/arch/arm/mach-stm32mp/Makefile
+++ b/arch/arm/mach-stm32mp/Makefile
@@ -9,7 +9,7 @@
 obj-y += soc.o
 
 obj-$(CONFIG_STM32MP15x) += stm32mp1/
-obj-$(CONFIG_STM32MP13x) += stm32mp1/
+obj-$(CONFIG_STM32MP13X) += stm32mp1/
 obj-$(CONFIG_STM32MP25X) += stm32mp2/
 
 obj-$(CONFIG_STM32_ECDSA_VERIFY) += ecdsa_romapi.o