drm/amd/display: Fix disbling PSR slow response issue

[Why]
dmub_psr_get_state() return an invalid PSR state while disable
the PSR because convert_psr_state() doesn't recognize the state
that return from DMCUB.

[How]
Add a PSR state to make the dmub_psr_get_state() return a
correct PSR state.
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Reviewed-by: Wayne Lin <Wayne.Lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc_types.h

@@ -597,6 +597,7 @@ enum dc_psr_state {
 	PSR_STATE4b_FULL_FRAME,
 	PSR_STATE4c_FULL_FRAME,
 	PSR_STATE4_FULL_FRAME_POWERUP,
+	PSR_STATE4_FULL_FRAME_HW_LOCK,
 	PSR_STATE5,
 	PSR_STATE5a,
 	PSR_STATE5b,

drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c

@@ -87,6 +87,8 @@ static enum dc_psr_state convert_psr_state(uint32_t raw_state)
 		state = PSR_STATE4c_FULL_FRAME;
 	else if (raw_state == 0x4E)
 		state = PSR_STATE4_FULL_FRAME_POWERUP;
+	else if (raw_state == 0x4F)
+		state = PSR_STATE4_FULL_FRAME_HW_LOCK;
 	else if (raw_state == 0x60)
 		state = PSR_STATE_HWLOCK_MGR;
 	else if (raw_state == 0x61)