perf tools: Sync copy of x86's syscall table

To get up to the recent compat pread/pwrite changes, that albeit not
being used by 'perf trace' due to some raw_syscalls tracepoint
limitations, trigger this warning when building perf:

  Warning: x86_64's syscall_64.tbl differs from kernel

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-ilgqhxd9ubkg5f66bx0bht2t@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/entry/syscalls/syscall_64.tbl

@@ -374,5 +374,5 @@
 543	x32	io_setup		compat_sys_io_setup
 544	x32	io_submit		compat_sys_io_submit
 545	x32	execveat		compat_sys_execveat/ptregs
-534	x32	preadv2			compat_sys_preadv2
-535	x32	pwritev2		compat_sys_pwritev2
+546	x32	preadv2			compat_sys_preadv64v2
+547	x32	pwritev2		compat_sys_pwritev64v2