msm: clock-8960: Support 8960ab gfx speed-push

Certain 8960ab devices have a graphics core capable of running at 440MHz.
These devices are distinguished from regular 8960ab devices through a
speed bin attribute located in efuse.

Configure PLL3 to provide 880 Mhz, which is divided down to the rate
graphics requires.

Change-Id: I9d9e8d52bff1345809450dc24ef55667f7317775
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
1 file changed