Allow User select Tablet Mode

Device overlay variables for tablet mode on Tuna.
Needs other Tablet UI commits.

Change-Id: I466ffa9dac9e5e553d37855f8e8d153fc583e5a0
Signed-off-by: Zaphod <mwilson@acesappraisal.com>
grouper: Inline kernel building - from AOSP

don't copy non-existing kernel

Change-Id: I6b52231385dc5f78f3af97d66f0911dceafbefc4
Signed-off-by: Gergely Szell <sethyx@gmail.com>
Move kernel definitions into Common (for tilapia)

Change-Id: I2321336177839e1c2b5ed5c13f27fed4191668ad
Signed-off-by: Gergely Szell <sethyx@gmail.com>