target-mips: fix {RD, WR}PGPR in microMIPS

rt, rs were swapped
Signed-off-by: NYongbok Kim <yongbok.kim@imgtec.com>
Reviewed-by: NAurelien Jarno <aurelien@aurel32.net>
Reviewed-by: NLeon Alrae <leon.alrae@imgtec.com>
Signed-off-by: NLeon Alrae <leon.alrae@imgtec.com>

target-mips/translate.c

@@ -13001,12 +13001,12 @@ static void gen_pool32axf (CPUMIPSState *env, DisasContext *ctx, int rt, int rs)
         case RDPGPR:
             check_cp0_enabled(ctx);
             check_insn(ctx, ISA_MIPS32R2);
-            gen_load_srsgpr(rt, rs);
+            gen_load_srsgpr(rs, rt);
             break;
         case WRPGPR:
             check_cp0_enabled(ctx);
             check_insn(ctx, ISA_MIPS32R2);
-            gen_store_srsgpr(rt, rs);
+            gen_store_srsgpr(rs, rt);
             break;
         default:
             goto pool32axf_invalid;