drm/amd: add dc feature mask flags for PSR allow smu and multi-display optimizations

[Why]
Allow for PSR SMU optimization and PSR multiple display optimization.

[How]
Add feature flags of PSR smu optimization and PSR multiple display
optimiztaion, and set them during init sequence. By default, flags
are disabled.
Signed-off-by: David Zhang <dingchen.zhang@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/amd_shared.h

@@ -234,6 +234,8 @@ enum DC_FEATURE_MASK {
 	DC_EDP_NO_POWER_SEQUENCING = (1 << 4), //0x10, disabled by default
 	DC_DISABLE_LTTPR_DP1_4A = (1 << 5), //0x20, disabled by default
 	DC_DISABLE_LTTPR_DP2_0 = (1 << 6), //0x40, disabled by default
+	DC_PSR_ALLOW_SMU_OPT = (1 << 7), //0x80, disabled by default
+	DC_PSR_ALLOW_MULTI_DISP_OPT = (1 << 8), //0x100, disabled by default
 };
 
 enum DC_DEBUG_MASK {