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/stm32mp1/Makefile b/arch/arm/mach-stm32mp/stm32mp1/Makefile
index 94c7724..e74342d 100644
--- a/arch/arm/mach-stm32mp/stm32mp1/Makefile
+++ b/arch/arm/mach-stm32mp/stm32mp1/Makefile
@@ -5,7 +5,7 @@
 
 obj-y += cpu.o
 
-obj-$(CONFIG_STM32MP13x) += stm32mp13x.o
+obj-$(CONFIG_STM32MP13X) += stm32mp13x.o
 obj-$(CONFIG_STM32MP15x) += stm32mp15x.o
 
 obj-$(CONFIG_STM32_ECDSA_VERIFY) += ecdsa_romapi.o