meta-android: android-system-image: add support for symbols debug symbols

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-samsung: android-system-image-tuna: install system symbols

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-asus: android-system-image-grouper: install system symbols

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