Revert "Switch AOSP ARM build to use GCC 4.8."

GCC 4.8 is breaking Lens Blur on the google camera across all our devices besides I do not see a speed increases or any difference between 4.8 and 4.7 

This reverts commit 5a5f92ee796fe34e44a90fea69f66c6e155130c9.

Change-Id: I00676337189efe0cebed028cca47ed4d28711e2a