Merge changes from topic "allwinner_pmic" into integration
* changes:
allwinner: Convert AXP803 regulator setup code into a driver
allwinner: a64: power: Use fdt_for_each_subnode
allwinner: a64: power: Remove obsolete register check
allwinner: a64: power: Remove duplicate DT check
allwinner: Build PMIC bus drivers only in BL31
allwinner: a64: power: Make sunxi_turn_off_soc static
allwinner: Merge duplicate code in sunxi_power_down
allwinner: Clean up PMIC-related error handling
allwinner: Synchronize PMIC enumerations
allwinner: Enable clock before resetting I2C/RSB