parisc: allocate sys_membarrier system call number

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Tested-by: Helge Deller <deller@gmx.de>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: linux-api@vger.kernel.org
CC: "James E.J. Bottomley" <jejb@parisc-linux.org>
CC: linux-parisc@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/kernel/syscall_table.S

@@ -438,6 +438,7 @@
 	ENTRY_SAME(memfd_create)	/* 340 */
 	ENTRY_SAME(bpf)
 	ENTRY_COMP(execveat)
+	ENTRY_SAME(membarrier)
 
 
 .ifne (. - 90b) - (__NR_Linux_syscalls * (91b - 90b))