Track our own custom 4.8 toolchain

Change-Id: I563af873504e936624d7837233fc60d11ae653c4
Track our own custom 4.7 toolchain

Change-Id: Ied97a0224ca6058d7148c46bbc89af4f242618b0
Merge changes Ied97a022,I563af873 into 4.4

* changes:
  Track our own custom 4.7 toolchain
  Track our own custom 4.8 toolchain