swcore: by default reserve 256 pages in MPM for HP traffic

modules/wrsw_swcore/xswc_core.vhd

@@ -167,7 +167,7 @@ architecture rtl of xswc_core is
    constant c_res_mmu_resource_num_width      : integer := 2;
    ----------------------------------------------
 
-   constant c_ALMOST_FULL_THR : integer := 40;
+   constant c_ALMOST_FULL_THR : integer := 256;
 
    ----------------------------------------------------------------------------------------------------
    -- signals connecting >>Input Block<< with >>Memory Management Unit<<