meta-android: android-system[-image]: don't place ramdisk image in /boot

On some devices we have to mount the real boot partition on /boot so we can put anything
else in there. Therefor we place the ramdisk image in /usr/lib/android-system

This also changes the recipe to fail the build when the system image doesn't contain any
ramdisk image.

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-hp: initrdscripts: unmount boot partition after not using it anymore

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-hp: linux-hp-tenderloin: don't automatically load ath6kl module

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