USBGadgetHAL: Read supported compositions from file

Parse the vid/pid compositions from file /vendor/etc/usb_compositions.conf
placed on device.

Change-Id: I96b7298de91b770dd17ea2f288ceb719f745869d
4 files changed
tree: f78cdf74571b9ad937ed8a88392cf931be99d9d3
  1. etc/
  2. hal/
  3. vendor_product.mk