Canonicalize more arm linux syscalls

Canonicalize more arm linux syscalls

This patch is to canonicalize more syscalls on arm linux in process
record.  In this patch, I also comment out some syscalls which isn't
handled by GDB now.  With this patch applied, two fails are fixed.

-FAIL: gdb.reverse/fstatat-reverse.exp: continue to breakpoint: marker2
-FAIL: gdb.reverse/recvmsg-reverse.exp: continue to breakpoint: marker2

gdb:

2016-03-21  Yao Qi  <yao.qi@linaro.org>

	* arm-linux-tdep.c (arm_canonicalize_syscall): Canonicalize
	more syscalls.