meta-android: android-system-image: add base recipe for system image installation

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-samsung: android-system-iamge-tuna: add recipe to provide the needed system image

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-samsung: set android-system-image-tuna as provider for virtual/android-system-image

Signed-off-by: Simon Busch <morphis@gravedo.de>