hammerhead: Add qcom perf library, update mpdecision

Also, remove a deprecated flag.

Change-Id: I196ef162ecec37befaac6d3b041a4400474361a6
Permit install on bootloader HHZ12d

(Lollipop preview installs HHZ12d)

Change-Id: Ic69124b59e99244e3b82788c5c3a712421d7ce42

Conflicts:
	board-info.txt