Revert "drm/amdgpu/display: change pipe policy for DCN 2.1"

This reverts commit fa458eb1.

The issue is no longer present even with this commit present
as verified by the original reporter.
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1849#note_1759599Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c

@@ -642,7 +642,7 @@ static const struct dc_debug_options debug_defaults_drv = {
 		.clock_trace = true,
 		.disable_pplib_clock_request = true,
 		.min_disp_clk_khz = 100000,
-		.pipe_split_policy = MPC_SPLIT_AVOID_MULT_DISP,
+		.pipe_split_policy = MPC_SPLIT_DYNAMIC,
 		.force_single_disp_pipe_split = false,
 		.disable_dcc = DCC_ENABLE,
 		.vsr_support = true,