perf tests: Disable breakpoint accounting test for powerpc

perf tests: Disable breakpoint accounting test for powerpc

We disable this test as instruction breakpoints (HW_BREAKPOINT_X) are
not available for powerpc.

Before applying patch:

  21: Breakpoint accounting                                 :
  --- start ---
  test child forked, pid 3635
  failed opening event 0
  failed opening event 0
  watchpoints count 1, breakpoints count 0, has_ioctl 1, share 0
  test child finished with -2
  ---- end ----
  Breakpoint accounting: Skip

After applying patch:

  21: Breakpoint accounting                                 : Disabled

Signed-off-by: Sandipan Das <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Naveen N. Rao <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>