arch: rename MPU_STACK_OVERFLOW_PROTECTION_DISABLE
arch: rename MPU_STACK_OVERFLOW_PROTECTION_DISABLE

There are two kinds of stack overflow protection, reg and mpu.
So, MPU_STACK_OVERFLOW_PROTECTION_DISABLE could give wrong information
like it disables mpu based stack overflow protection. But it means
not to use stack overflow protection regardless of type.
Let's rename it to STACK_OVERFLOW_PROTECTION_DISABLE.

Signed-off-by: sunghan-chang <c954e25285721d8faa8b1a5c1ae2ef5a35338d32@samsung.com>

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