WriteLokiImage

Add new def to run commands neccesary to flash loki_patch'ed aboot.img
(boot.lok) for jflteatt/vzw due to secure boot

Still requires the aboot.img to be loki_patch'd prior to flashing

Requires TARGET_USES_LOKI := true in BoardConfig

Change-Id: I5be37951450ec327ccf29935306aac7c46a215d2
Signed-off-by: Brandon McAnsh <brandon.mcansh@gmail.com>