Tweaked SIO for the new omap hsmmc driver

Quote from my XDA thread:
But here comes the awesomeness: I have pulled updates for the hsmmc driver
(high speed multimedia card; the Tuna's 'harddrive controller' if you will)
from the Texas Instruments repo. While I noticed an initial improvement of
many apps' loading times, I began to tweak the SIO scheduler and got to a
point where... Oh well. See for yourselves.

Conflicts:
	block/sio-iosched.c

Change-Id: I92dcd94015ba04d125c3d839db209c5d1c416666