drm/amdgpu: Add amdgpu_asic_funcs.reset_method for Vega20

Fixes GPU reset crash.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/soc15.c

@@ -896,6 +896,7 @@ static const struct amdgpu_asic_funcs vega20_asic_funcs =
 	.get_pcie_usage = &soc15_get_pcie_usage,
 	.need_reset_on_init = &soc15_need_reset_on_init,
 	.get_pcie_replay_count = &soc15_get_pcie_replay_count,
+	.reset_method = &soc15_asic_reset_method
 };
 
 static int soc15_common_early_init(void *handle)