oprofile: Include operf command

oprofile: Include operf command

This is the main command to control oprofile.  It was introduced in
version 0.9.8 from 2012-08-27 and in version 1.0.0 the previous
control tool, opcontrol, was removed.

In commit 9863553fe8fa16a4d19f652b409a44bb58ef5567, removing avr32
support, code that added operf for !avr32 was removed rather than
keeping the code but making it non-conditional.

Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>