tools headers: Update x86's syscall_64.tbl with the kernel sources

To pick the changes from:

  d3b1b776 ("x86/entry/64: Remove ptregs qualifier from syscall table")
  cab56d34 ("x86/entry: Remove ABI prefixes from functions in syscall tables")
  27dd84fa ("x86/entry/64: Use syscall wrappers for x32_rt_sigreturn")

Addressing this tools/perf build warning:

  Warning: Kernel ABI header at 'tools/perf/arch/x86/entry/syscalls/syscall_64.tbl' differs from latest version at 'arch/x86/entry/syscalls/syscall_64.tbl'
  diff -u tools/perf/arch/x86/entry/syscalls/syscall_64.tbl arch/x86/entry/syscalls/syscall_64.tbl

That didn't result in any tooling changes, as what is extracted are just
the first two columns, and these patches touched only the third.

  $ cp /tmp/build/perf/arch/x86/include/generated/asm/syscalls_64.c /tmp
  $ cp arch/x86/entry/syscalls/syscall_64.tbl tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
  $ make -C tools/perf O=/tmp/build/perf install-bin
  make: Entering directory '/home/acme/git/perf/tools/perf'
    BUILD:   Doing 'make -j12' parallel build
    DESCEND  plugins
    CC       /tmp/build/perf/util/syscalltbl.o
    INSTALL  trace_plugins
    LD       /tmp/build/perf/util/perf-in.o
    LD       /tmp/build/perf/perf-in.o
    LINK     /tmp/build/perf/perf
  $ diff -u /tmp/build/perf/arch/x86/include/generated/asm/syscalls_64.c /tmp/syscalls_64.c
  $

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>