Revert "Add option to flag 4.7 builds for devices that do not support 4.9 yet"

This reverts commit f550502fd7cd6716473a4fb70d7282b5552cafe5.
Revert "Allow building with SaberMod/Linaro Toolchains"

This reverts commit 025dca8b5cd0f29042a714b159744b17b1b59df7.