drm/amd/display: refactor clk_resync to avoid assertion

- not all DCE has PHYPLLA_PIXCLK_DOUBLE_RATE_ENABLE bit defined.

Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>