prebuilts: Sync with axDev toolchain 4.8-2013.07

Based off Linaro GCC 4.8-2013.07 with upstream GCC 4.8 merged (r200858),
tuned for armv7-a/neon/cortex-a9 and Android specific commits picked from
AOSP GCC master branch.

MANIFEST_REPO=https://github.com/axDev-toolchain/manifest.git
MANIFEST_BRANCH=linaro-staging
GCC_URL=https://github.com/axDev-toolchain/gcc-4.8.git
HOSTGCC=4.6

with-arch=armv7-a
with-tune=cortex-a9
with-float=softfp
with-fpu=neon

Change-Id: Ifa7c3d3d114d2ec02cd3f260b923189ee264f79e
Signed-off-by: Rob Beane <robbeane@gmail.com>