oprofile: avoid processing files under .pc

oprofile: avoid processing files under .pc

Fix the below issue:
| DEBUG: Executing shell function do_configure
| sed: can't read ./.pc/opstart.patch/doc/opstop.1.in: Permission denied
| sed: can't read ./.pc/opstart.patch/doc/opstart.1.in: Permission
denied
| sed: can't read ./.pc/opstart.patch/utils/opstart.c: Permission denied
| ERROR: Function failed: do_configure

(From OE-Core rev: d1003ea86543ce5d09c163db95e9e723aa1adc10)

Signed-off-by: Ting Liu <b28495@freescale.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>