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

This reverts commit dc65d042e6e5b569948559c1b9f0f7ab3aec04ca.
Revert "Allow building with SaberMod/Linaro Toolchains"

This reverts commit e45417df07e017b44c6512d7f738a2ec36b42c03.