msm: acpuclock-8064: add higher bus speed and use it for OC frequencies (v2)

The previous patch seems to be causing a little more heat.
https://github.com/mrg666/android_kernel_mako/commit/87e04e7f50bde7e56b1cea4b8f9a53c3172ce28e
This patch tries the same without continuously scaling the L2 frequency
- add 600 MHz bus speed
- add 1188 MHz L2 speed using the new bus speed
- use 1188 L2 speed for OC cpu frequencies
msm: acpuclock-8064: use higher bus speed at lower CPU freqs by bedalus
Bedalus suggested that if lower CPU frequencies can offer higher bus speed,
GPU use during games wouldn't require higher CPU frequency.
My testing demonstrated 4C drop in CPU temp during 3DMark benchmark.
Still needs to be tested for everyday use.
Merge remote-tracking branch 'upstream/master'