MIPS: Wire up userfaultfd and membarrier syscalls.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --cc arch/mips/include/uapi/asm/unistd.h
Simple merge

diff --cc arch/mips/kernel/scall32-o32.S
Simple merge

diff --cc arch/mips/kernel/scall64-64.S
Simple merge

diff --cc arch/mips/kernel/scall64-n32.S
Simple merge

diff --cc arch/mips/kernel/scall64-o32.S
Simple merge