drm/amd/display: use low clocks for no plane configs

[ Upstream commit 2641c7b7 ]

Stream only configurations do not require DCFCLK, SOCCLK, DPPCLK
or FCLK. They also always allow pstate change.

Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: 49f26218 ("drm/amd/display: fix dcn315 single stream crb allocation")
Signed-off-by: Sasha Levin <sashal@kernel.org>