mfd: rtsx: Add func to split u32 into register
mfd: rtsx: Add func to split u32 into register

Add helper function to write u32 to registers, if we want to put u32
value to 4 continuous register, this can help us reduce tedious work.

Signed-off-by: Micky Ching <8367ad45e171c2f2f5c074b48b95b376340e04cb@realsil.com.cn>
Signed-off-by: Lee Jones <630e34333487a351a857f6b705e04d30b37c1629@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs