HDMI PD is power off when system suspend, so ih_mute register
bit0 mute_all_interrupt will be reset to 1 when system resume.
HPD interrupt will be mask, that would cause hdmi plugin could
not be detected.
Change-Id: I3bf2e6116e902cd516a7ac69fbe8569ca943e853
Signed-off-by: Bin Yang <yangbin@rock-chips.com>