drm/amd/display: initialize RN gpuvm context programming function

Renoir can use vm contexes as long as HOSTVM is off so
this should be initialized.
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hubbub.c

@@ -628,7 +628,7 @@ void hubbub21_apply_DEDCN21_147_wa(struct hubbub *hubbub)
 static const struct hubbub_funcs hubbub21_funcs = {
 	.update_dchub = hubbub2_update_dchub,
 	.init_dchub_sys_ctx = hubbub21_init_dchub,
-	.init_vm_ctx = NULL,
+	.init_vm_ctx = hubbub2_init_vm_ctx,
 	.dcc_support_swizzle = hubbub2_dcc_support_swizzle,
 	.dcc_support_pixel_format = hubbub2_dcc_support_pixel_format,
 	.get_dcc_compression_cap = hubbub2_get_dcc_compression_cap,