soc: sam_e70: Mpu regions should include SRAM regions.
soc: sam_e70: Mpu regions should include SRAM regions.

In order to disable the execution of code from the RAM region
we need to declare it in arm_mpu_regions.c file.

Signed-off-by: Adithya Baglody <06b44f6fa9a97a2b955c2d2cd070279967447860@intel.com>

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