hammerhead: switch to 4.8 toolchain

Change-Id: I230326753c4c04c8b589eefd964f6ef3f28ef77f

Conflicts:
	BoardConfig.mk

 Author:    Lars Greiss <kufikugel@googlemail.com>
hammerhead: update toolchain again

Change-Id: I71fdbb7cdedd9e22499116371342c2264b0763f5

Conflicts:
	BoardConfig.mk

 Author:    Lars Greiss <kufikugel@googlemail.com>