lowlevel-blt-bench: refactor to Mpx_per_sec()

Refactor the Mpixels/s computations into a function. Easier to read and
better documents what is being computed.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ben Avison <bavison@riscosopen.org>
1 file changed