arch: arm: optimize _size_to_mpu_rasr_size function
This commit optimizes _size_to_mpu_rasr_size(.) in the ARMv7-M
MPU driver, so it makes use of a single _builtin_clz() function
call, instead of two.
Signed-off-by:
Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
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