Backport Power-Domain and BLK CTRL support from latest upstream patches

Recently fixes and support for the GPCv2 Power Domain driver and the BLK CTRL driver have been picked upstream and are currently pending in linux-next. These patches include some major improvements and fixes that prevent lockups at boot and suspend/resume. They also provide the base for adding proper support for peripherals that depend on this like VPU, GPU, DISP, CSI, PCIe and USB.

This MR replaces the legacy implementation from one of the previous iterations of the proposed upstream patchset with the current code. So far this has been tested to bring up the GPU, Display and USB properly on a Kontron DK i.MX8MM.