bus/fslmc: remove conflicting memory barrier macro

[ upstream commit 24ffb8c ]

There are two definitions conflicting each other, for more
details, refer to [1].

include/rte_atomic_64.h:19: error: "dmb" redefined [-Werror]
drivers/bus/fslmc/mc/fsl_mc_sys.h:36: note: this is the location of the
previous definition
 #define dmb() {__asm__ __volatile__("" : : : "memory"); }

The fix is to reuse the EAL definition to avoid conflicts.

[1] http://inbox.dpdk.org/users/VI1PR08MB537631AB25F41B8880DCCA988FDF0@
VI1PR08MB5376.eurprd08.prod.outlook.com/T/#u

Fixes: 3af733b ("bus/fslmc: introduce MC object functions")

Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Phil Yang <phil.yang@arm.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>

drivers/bus/fslmc/mc/fsl_mc_sys.h

@@ -32,11 +32,10 @@ struct fsl_mc_io {
 #include <sys/uio.h>
 #include <linux/byteorder/little_endian.h>
 
-#ifndef dmb
-#define dmb() {__asm__ __volatile__("" : : : "memory"); }
-#endif
-#define __iormb()	dmb()
-#define __iowmb()	dmb()
+#include <rte_atomic.h>
+
+#define __iormb()	rte_io_rmb()
+#define __iowmb()	rte_io_wmb()
 #define __arch_getq(a)		(*(volatile uint64_t *)(a))
 #define __arch_putq(v, a)	(*(volatile uint64_t *)(a) = (v))
 #define __arch_putq32(v, a)	(*(volatile uint32_t *)(a) = (v))