arm64/mpam: don't reserve mon 0, we can use it as nomarl

hulk inclusion
category: feature
bugzilla: 5510
CVE: NA
Signed-off-by: NXie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

arch/arm64/kernel/mpam_mon.c

@@ -87,9 +87,6 @@ void mon_init(void)
 	}
 
 	mon_free_map = BIT_MASK(num_mon) - 1;
-
-	/* pmg 0 is always reserved for the default group */
-	mon_free_map &= ~1;
 }
 
 int alloc_mon(void)