meta-android: android-system-image: don't provide adbd anymore

adbd is now provided by android-tools in a glibc variant.

Signed-off-by: Simon Busch <morphis@gravedo.de>
android-system: add as replacement for android-initscripts with systemd support

Signed-off-by: Simon Busch <morphis@gravedo.de>
android-tools: add as replacement to adb recipe

* build from ubuntu's android-tools package source
* has systemd support to enable USB adb gadget and starting adbd daemon on system startup

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-samsung: systemd-machine-units: only exclude rndissetup when no adb in DISTRO_FEATURE

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