arm64: io: Hook up __io_par() for inX() ordering

mainline inclusion
from mainline-5.0
commit 2c97a9cc35a7a73a7580a8e2632419ff3c0b0fe5
category: bugfix
bugzilla: NA
CVE: NA

Ensure that inX() provides the same ordering guarantees as readX()
by hooking up __io_par() so that it maps directly to __iormb().
Reported-by: NAndrew Murray <andrew.murray@arm.com>
Reviewed-by: NPalmer Dabbelt <palmer@sifive.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NXuefeng Wang <wxf.wang@hisilicon.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

arch/arm64/include/asm/io.h

@@ -123,6 +123,7 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
 		     : "memory");					\
 })
 
+#define __io_par(v)		__iormb(v)
 #define __iowmb()		wmb()
 
 #define mmiowb()		do { } while (0)