arch/arm/common: remove unnecessary conditional in up_mpuinit.c
arch/arm/common: remove unnecessary conditional in up_mpuinit.c

Currently up_mpuinit.c has two conditionals which cover entire source code.
They are CONFIG_BUILD_PROTECTED and CONFIG_ARM_MPU.
But MPU could be used regardless of CONFIG_BUILD_PROTECTED for cache setting, RAM setting and so on.
Let's remove CONFIG_BUILD_PROTECTED conditional.

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

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