add marchid setting to CoreDSL description

gen_input/TGC_B.core_desc

@@ -8,6 +8,7 @@ Core TGC_B provides RV32I {
         // definitions for the architecture wrapper
         //                    XL    ZYXWVUTSRQPONMLKJIHGFEDCBA
         unsigned MISA_VAL = 0b01000000000000000000000100000000;
+        unsigned MARCHID_VAL = 0x80000002;
 	}
 }