drm/amd/display: Eliminate recursive header inclusion

[WHAT & HOW]
This removes recursive inclusion like dc.h -> dc_state.h -> dc.h and
dc.h -> dc_plane.h -> dc.h

This fixes 4 PW.INCLUDE_RECURSION issues reported by Coverity.

Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>