android-tools: split out machine specific configuration

* usb gadget configuration can be different from device to device so we have to keep it in
  a separate package which is machine specific

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-asus/meta-lg/meta-samsung: grouper/maguro/mako: update android-system-image

Signed-off-by: Simon Busch <morphis@gravedo.de>
android-system: minor fixes

* start service manager which is required on some devices
* correctly check for the existence of /persist/wifi directory

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-hp: creating a new layer for HP devices

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-hp: conf: machine: add machine configuration for HP touchpad

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-hp: initramfs-boot-android: add touchpad specific init script

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-hp: android-tools-conf: add touchpad specific gadget configuration

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-hp: linux-hp-tenderloin: add kernel build configuration

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