PMU is the power management unit and GRF is the general register file. Both
are heavily used in U-Boot. Add header files with register definitions.
Signed-off-by: Simon Glass <sjg@chromium.org>
Add header files for the peripherals and clocks supported on Rockchip
platforms. The particular implementation (and register set) for each is
SoC-specific, but it seems that the naming can be generic.
Signed-off-by: Simon Glass <sjg@chromium.org>
