drm/rockchip: analogix_dp: introduce the pclk for grf
For RK3399's GRF module, if we want to operate the graphic related grf registers, we need to enable the pclk_vio_grf which supply power for VIO GRF IOs, so it's better to introduce an optional grf clock in driver. Signed-off-by:Yakir Yang <ykk@rock-chips.com> Reviewed-by:
Douglas Anderson <dianders@chromium.org> Reviewed-by:
Tomasz Figa <tomasz.figa@chromium.com>
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