drm/amdgpu/display: use kvzalloc again in dc_create_state

It looks this was accidently lost in a follow up patch.
dc context is large and we don't need contiguous pages.

Fixes: e4863f11 ("drm/amd/display: Multi display cause system lag on mode change")
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Aric Cyr <aric.cyr@amd.com>
Cc: Alex Xu <alex_y_xu@yahoo.ca>
Reported-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca>
Tested-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -1575,8 +1575,8 @@ static void init_state(struct dc *dc, struct dc_state *context)
 
 struct dc_state *dc_create_state(struct dc *dc)
 {
-	struct dc_state *context = kzalloc(sizeof(struct dc_state),
-					   GFP_KERNEL);
+	struct dc_state *context = kvzalloc(sizeof(struct dc_state),
+					    GFP_KERNEL);
 
 	if (!context)
 		return NULL;