drm/amdgpu: reduce reserved VA size

1MB should be more than enough, currently we use about 8K.
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Acked-by: NMonk Liu <monk.liu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h

@@ -99,7 +99,7 @@ struct amdgpu_bo_list_entry;
 #define AMDGPU_MMHUB				1
 
 /* hardcode that limit for now */
-#define AMDGPU_VA_RESERVED_SIZE			(8ULL << 20)
+#define AMDGPU_VA_RESERVED_SIZE			(1ULL << 20)
 
 /* VA hole for 48bit addresses on Vega10 */
 #define AMDGPU_VA_HOLE_START			0x0000800000000000ULL