Add release tools for hammerhead.
Add release tools for hammerhead.

This is required to pull up radio and bootloader images.

Bug: 9620810
Change-Id: I6be8491f60f754454f0487aca7c47bc55d39a007

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead