Revert "TEMP: AM33XX: Re-add votlagedomain data"

This reverts commit 97e4a6cabca8393bd08b8d630ce91e5e6e8eadf9.
ARM: AM33XX: Fix voltagedomain requirement for voltagedomains

Removed the voltdm requirement for powerdomain definition and added
member to pwrdm_ops for am335x to report no need for voltdm.
TEMP: DT: Remove GPMC from am335x-evm

Removed GPMC and NAND defs from dt to allow board to boot.