Remove Unused Linaro repo and add Generic Linaro 4.7

* Cortex-a8 is not as generic as cortex-a9 tuned linaro so let's move to this to help out some of our more generic cpus since this is the only linaro 4.7 toolchain on the manifest.

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>