Publish build scripts to build Android Kernels in AOSP. They include the
actual build script build/build.sh, helper scripts to run the
kernel/tests as well as common utilities for validating patches.

Refer to build.sh for documentation on how to invoke the kernel build.

Bug: 120282827
Signed-off-by: Matthias Maennich <maennich@google.com>
Change-Id: Id860c320ced4e9a2fd5e32b4730c7b86ac843294