DRIVERS: SLIMBUS: initial overclocking of slimbus .Increase

root freq from 11 (24.526MHz) to 31 max (27+MHz) which is the largest it
will
take .Increase clock gear from 7 to 10 (max again)

This means SLIMbus will use its maximum potential to give the best audio
quality for the hardware. Takes advantage of both hardware and the mods
from zeroinfinity, also opening the door for more things that were
previously limited by this. Researched and experimented by ZeroInfinity
and Poondog