build: Add script to generate extra images

Change-Id: I53081c7a2b4f18bc8c8a27b04d311a6b078b2022
Use standard qcom naming

Change-Id: I360b3dcf1fe82140a7993189e881f9d77b571bef
Merge changes I360b3dcf,I53081c7a into android-4.4

* changes:
  Use standard qcom naming
  build: Add script to generate extra images