Revert "Ethernet Configuration Managment for JellyBean (3-3): build/"

This reverts commit 29856b0f6ef59e9c98c80e146d6ce070477722ed.
Revert "core: more 4.7 fixes"

This reverts commit ec584b30fd34dc02b7446acee4836dc9b25af6fb.
Revert "envsetup: use 4.7 by default"

This reverts commit 83cf0f5669ccde9c0e4a45159227cf7ec9386583.
Revert "core: config: use 4.7 by default unless TARGET_GCC_VERSION is set otherwise"

This reverts commit f720fad0076bc06afc5c5f167af4c3a76a8eaa20.
Revert "Add TARGET_GCC_VERSION"

This reverts commit f6ba4994ddd1db42f1cc535b8ae6574266166a23.
use linaro toolchain

Change-Id: I33be4582cf8e991faed884d02965ec295e132a94