Add dtbtool
Allow inline kernel building
Update proprietary-blobs

Change-Id: Ibd0eb894dde27114795d278b28afc13b8674e35f

Conflicts:
	proprietary-blobs.txt
Fix mkbootimg.mk to include all revisions of msm8974-hammerhead

Multiple DTBs are supported in a single DT image and the appropriate
one will be picked based SOC revision, etc
hammerhead: Enable USB audio

Change-Id: I83861e0c70eeeb5035f89bfa4c32f19c21236437
hammerhead: Better USB audio support

 * Use new QCOM USB audio path which uses the AFE proxy.
 * This fixes the issues with skips and drops when UI sounds play.

Change-Id: I9941d49b669208959353805f43f51874a415eba3
hammerhead: fix proprietary-blobs list