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/configs/stm32mp13_defconfig b/configs/stm32mp13_defconfig
index 2d79bf0..c893e27 100644
--- a/configs/stm32mp13_defconfig
+++ b/configs/stm32mp13_defconfig
@@ -5,10 +5,10 @@
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0xc0400000
 CONFIG_ENV_OFFSET=0x900000
 CONFIG_DEFAULT_DEVICE_TREE="stm32mp135f-dk"
-CONFIG_STM32MP13x=y
+CONFIG_STM32MP13X=y
 CONFIG_DDR_CACHEABLE_SIZE=0x8000000
 CONFIG_CMD_STM32KEY=y
-CONFIG_TARGET_ST_STM32MP13x=y
+CONFIG_TARGET_ST_STM32MP13X=y
 CONFIG_ENV_OFFSET_REDUND=0x940000
 CONFIG_CMD_STM32PROG=y
 # CONFIG_ARMV7_NONSEC is not set