Cleanup AndroidKernel.mk:

modules and modversions are both now enabled in the kernel
so add back the missing code to build and install modules

remove ARM_EABI_TOOLCHAIN and gcc version, these are both set
in the android build environment.  Build both ROM and kernel with
same gcc version

Signed-off-by: Paul Beeler <sparksco@gmail.com>
Merge remote-tracking branch 'AOSPAL/master'