target/platform: MSM8952 Bringup changes.

This patch adds support for -
1. Correct the USB freq plan.
2. Change the Volume up key GPIO status from Active high to low.
3. Update the mmu mapping for the scratch region

Change-Id: I45b5ea05e7cd70a52ded49c81d2cd1fd3f0ad6d6
3 files changed