[msm8660]: Add fastboot key detection for QT8660

Due to a hardware design bug, keypad controller in PM8058 could not be
used for key detection. Hence detecting it by configuring PM8058 GPIOs
as normal function and accessing it over SSBI

Change-Id: I92db69fe504598a6d1dfc0736642b1cb7a02be4c
6 files changed