Add repos for external/kernel-headers, external/libnfc-nxp,  hybris-boot and droid-hal-device

Change-Id: I6538e39e2ac28d1b0550a6bd0106168308adc89c
Signed-off-by: David Greaves <david.greaves@jollamobile.com>
Use a branch of busybox and install droid-hal-device to rpm/

Change-Id: Ic0b590459d2a96e8fbeda06257cae4a3b8b77488
Signed-off-by: David Greaves <david.greaves@jollamobile.com>
Merge remote-tracking branch 'mer-hybris/hybris-10.1'