drm/amd/display/dmub/src/dmub_dcn30: Include our own header containing prototypes

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dmub/src/dmub_dcn30.c:83:6: warning: no previous prototype for ‘dmub_dcn30_backdoor_load’ [-Wmissing-prototypes]
 drivers/gpu/drm/amd/amdgpu/../display/dmub/src/dmub_dcn30.c:118:6: warning: no previous prototype for ‘dmub_dcn30_setup_windows’ [-Wmissing-prototypes]

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn30.c

@@ -26,6 +26,7 @@
 #include "../dmub_srv.h"
 #include "dmub_reg.h"
 #include "dmub_dcn20.h"
+#include "dmub_dcn30.h"
 
 #include "sienna_cichlid_ip_offset.h"
 #include "dcn/dcn_3_0_0_offset.h"