qcom-common: Add releasetools for assertions

 * Releasetools extension for adding bootloader version assertion.

Change-Id: I52bf448a0dbaf5078848fadb4fae4d471355b15f
qcom-common: Update USB startup script

 * Needed to handle rmnet_usb startup on newer kernels

Change-Id: Id8a58b17af4fb5be506532030a28a26af2d277e1