drm/amd/display: Add dtb clock to dc_clocks

Reviewed-by: NAriel Bernstein <Eric.Bernstein@amd.com>
Acked-by: NPavle Kotarac <Pavle.Kotarac@amd.com>
Signed-off-by: NDillon Varone <dillon.varone@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -417,6 +417,7 @@ struct dc_clocks {
 #if defined(CONFIG_DRM_AMD_DC_DCN)
 	enum dcn_zstate_support_state zstate_support;
 	bool dtbclk_en;
+	int dtbclk_khz;
 #endif
 	enum dcn_pwr_state pwr_state;
 	/*