init.sh: Updates

- Added Nexus 7 WIFI
- Use CCACHE in make_kernel alias

Signed-off-by: Andreas Pohl <apohl79@gmail.com>
buildrom.sh: Fixed incremental build dev packages for release builds and added build archives.

Signed-off-by: Andreas Pohl <apohl79@gmail.com>
osarmod: Added grouper (Nexus 7 WIFI)

Signed-off-by: Andreas Pohl <apohl79@gmail.com>
Added buildarchive.pl

Signed-off-by: Andreas Pohl <apohl79@gmail.com>