[platform/msm7x30]: Add code to bump up the ACPU clock.

Add code to enable PLL2. Modify the clock source to use PLL2.
This will bump up the ACPU clock of 7x30/8x55 targets to
806MHz/1GHz.

Change-Id: I7be42a45dca8996cf6374982f982b078994a855c
1 file changed