platform/target: mdm9640: Add support for mdmcalifornium

* USB mock_utmi, sleep, pipe clock support
* Get qmp phy settings from target
* Voldown support
* Reset phy from target
* Fix data abort when get_target_boot_params return null
* Add register to differentiate single ended and differential clocks

Change-Id: I22ac90cd0b5b39793aeb7493422fc8f479642788
10 files changed