perf trace syscall table generation for powerpc with syscall.tbl

Hi Ravi,

	I noticed that in:

  commit ab66dcc76d6ab8fae9d69d149ae38c42605e7fc5
  Author: Firoz Khan [off-list ref]
  Date:   Mon Dec 17 16:10:36 2018 +0530

    powerpc: generate uapi header and system call table files

powerpc now generates its syscall tables headers from a syscall.tbl just
like x86 and s390, could you please switch to using it, taking the x86
and s390 scripts as a starting point, then test on your systems
everything works?

Thanks,

- Arnaldo