[U-Boot] Rework needed for SMDK5250 re PMIC to POWER transition

[Albert ARIBAUD]

Hello,

Commit 0d146a56 (from Rajesh, applied by Minkyu) introduced SMDK5250
support for the MAX77686 pmic chip. However, u-boot/master has reworks
for PMIC that make this support break when merging u-boot-arm and
u-boot.

Rajesh, can you look into it and provide a fix to Minkyu?

Minkyu, can you add this to the fix pull request already needed for
universal?

Thanks in advance!

Amicalement,
-- 
Albert.