meta-android: initramfs-android-image: create as replacement for the chroot-image

chroot-image/chroot-scripts doesn't apply to the naming conventions for initramfs recipes
within OE so everything is converted to be correctly named.

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-android: kernel_android: use initramfs-android-image instead of chroot-image

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-android: libhybris: bump SRCREV

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-android: android-system: prevent android from remounting rootfs read-only

The sed call was actually wrong so it was never applied correcct to the init.rc script and
android still tried to mount / read-only.

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