drm/amd/display: Add missing callback for init_watermarks in DCN 301

Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn301/dcn301_hubbub.c

@@ -63,6 +63,7 @@ static const struct hubbub_funcs hubbub301_funcs = {
 	.verify_allow_pstate_change_high = hubbub1_verify_allow_pstate_change_high,
 	.force_wm_propagate_to_pipes = hubbub3_force_wm_propagate_to_pipes,
 	.force_pstate_change_control = hubbub3_force_pstate_change_control,
+	.init_watermarks = hubbub3_init_watermarks,
 	.hubbub_read_state = hubbub2_read_state,
 };