drm/amd/amdgpu: reserve vm invalidation engine for uni_mes

Reserve vm invalidation engine 6 when uni_mes enabled. It
is used in processing tlb flush request from host.

Signed-off-by: Michael Chen <[e-mail]>
Acked-by: Alex Deucher <[e-mail]>
Reviewed-by: Shaoyun liu <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>
(cherry picked from commit 873373739b9b150720ea2c5390b4e904a4d21505)
Cc: [e-mail]

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

···
 		/* reserve engine 5 for firmware */
 		if (adev->enable_mes)
 			vm_inv_engs[i] &= ~(1 << 5);
+		/* reserve engine 6 for uni mes */
+		if (adev->enable_uni_mes)
+			vm_inv_engs[i] &= ~(1 << 6);
 		/* reserve mmhub engine 3 for firmware */
 		if (adev->enable_umsch_mm)
 			vm_inv_engs[i] &= ~(1 << 3);