Add Minnowboard device type

Added a new device-type mixin for the MinnowBoard MAX, which
provides its own 'tablet_core_hardware.xml', to better reflect
the device's capabilities.

Issue: APDEV-2873
Issue: APDEV-2901

Change-Id: I8069add3e007382d753c57dcee44af49a2328f11
Depends-Change-Id: Idad85a70a77bc9fb851d2519866c09f40c7187cb
Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
Reviewed-on: https://android.intel.com/182380
Reviewed-by: Petrescu, Rares <rares.petrescu@intel.com>
Tested-by: Vlaescu, CristianX <cristianx.vlaescu@intel.com>
Reviewed-by: Musca, Constantin <constantin.musca@intel.com>
Reviewed-by: Serban, Mihai <mihai.serban@intel.com>
Add android.hardware.touchscreen feature to MinnowBoard

Adding the android.hardware.touchscreen back to the board's features,
since a screen with "fake touch" events, such as a mouse or a trackpad,
should be treated the same as a touch screen.

Change-Id: Ib8445c245c7be7b85c013f1ce42fca2e3f5c19da
Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
Reviewed-on: https://android.intel.com/184650
Reviewed-by: Chiras, Robert <robert.chiras@intel.com>