drm/amdgpu: fix vbios reservation handling on SR-IOV

There is no reserveration so set the size to 0.  Fixes
a regression on SR-IOV.
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c

@@ -496,7 +496,8 @@ void amdgpu_gmc_get_vbios_allocations(struct amdgpu_device *adev)
 		break;
 	}
 
-	if (!amdgpu_device_ip_get_ip_block(adev, AMD_IP_BLOCK_TYPE_DCE)) {
+	if (amdgpu_sriov_vf(adev) ||
+	    !amdgpu_device_ip_get_ip_block(adev, AMD_IP_BLOCK_TYPE_DCE)) {
 		size = 0;
 	} else {
 		size = amdgpu_gmc_get_vbios_fb_size(adev);