drm/amd/display: make calculate watermarks a function pointer

To allow code reuse with minimal duplication watermark
calculation needs to be function pointer.
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Eric Bernstein <Eric.Bernstein@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/inc/core_types.h

@@ -101,7 +101,11 @@ struct resource_funcs {
 					struct dc *dc,
 					struct dc_state *context,
 					bool fast_validate);
-
+	void (*calculate_wm)(
+				struct dc *dc, struct dc_state *context,
+				display_e2e_pipe_params_st *pipes,
+				int pipe_cnt,
+				int vlevel);
 	int (*populate_dml_pipes)(
 		struct dc *dc,
 		struct dc_state *context,