soc: arm: stm32: remove custom fixed MPU region definition

We remove the custom fixed MPU region definition from ST
STM32 SoC definitions, as the common fixed MPU
region definition is now used.

Signed-off-by: Ioannis Glaropoulos <[email protected]>

Author: ioannisg

soc/arm/st_stm32/common/CMakeLists.txt

@@ -1,6 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-zephyr_sources_ifdef(CONFIG_ARM_MPU arm_mpu_regions.c)
 zephyr_sources(stm32cube_hal.c)
 
 zephyr_linker_sources_ifdef(CONFIG_STM32_CCM SECTIONS ccm.ld)