amdgpu: add initial vangogh support

From internal git commit:
73a106310600acb05b8729621b11ad8f85e5995b

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -2539,6 +2539,17 @@ File: amdgpu/dimgrey_cavefish_smc.bin
 File: amdgpu/dimgrey_cavefish_sos.bin
 File: amdgpu/dimgrey_cavefish_ta.bin
 File: amdgpu/dimgrey_cavefish_vcn.bin
+File: amdgpu/vangogh_asd.bin
+File: amdgpu/vangogh_ce.bin
+File: amdgpu/vangogh_dmcub.bin
+File: amdgpu/vangogh_me.bin
+File: amdgpu/vangogh_mec2.bin
+File: amdgpu/vangogh_mec.bin
+File: amdgpu/vangogh_pfp.bin
+File: amdgpu/vangogh_rlc.bin
+File: amdgpu/vangogh_sdma.bin
+File: amdgpu/vangogh_toc.bin
+File: amdgpu/vangogh_vcn.bin
 
 Licence: Redistributable. See LICENSE.amdgpu for details.