drm/amd/display: Re-enable IPS2 for static screen

[Why]
IPS stability was fixed in bios.

[How]
Set disable_ips init flag to DMUB_IPS_ENABLE.
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -1740,7 +1740,7 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 	if (amdgpu_dc_debug_mask & DC_DISABLE_IPS)
 		init_data.flags.disable_ips = DMUB_IPS_DISABLE_ALL;
 	else
-		init_data.flags.disable_ips = DMUB_IPS_RCG_IN_ACTIVE_IPS2_IN_OFF;
+		init_data.flags.disable_ips = DMUB_IPS_ENABLE;
 
 	init_data.flags.disable_ips_in_vpb = 0;