capri: add 1.3 Ghz OC (optional)

Basic benchmark with "CPU Benchmark" application shows marginal
improvement for 1.3 GHz, with performance degradation for higher
frequencies.

The default setting sets the max frequency to 1.2 GHz (OC disabled
by default).

Benchmark result (in milliseconds)

1.2 GHz: 565 561 558 568 573 (avg: 565)
1.3 GHz: 551 550 548 544 548 (avg: 548)
1.4 GHz: 561 563 540 541 557 (avg: 552)
1.5 GHz: 556 563 566 560 564 (avg: 561)

Application: https://play.google.com/store/apps/details?id=com.unstableapps.cpubenchmark

Change-Id: I026c0727022f2db5d986780ac1fa441f1efa3964