Blackfin arch: Clean oprofile build path for blackfin

[Mike Frysinger <vapier.adi@gmail.com>: scrub comment header]

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>