Revert "make bootzip: add support for loki patch"

This reverts commit 1ef492d8a9575d91836801ad4a98d42fb397b1be.
Revert "Update boot_flash_from_image"

This reverts commit 8ce1f3d505f481facda6ed7c1e6b2a199587197f.
Revert "add support for building flashable kernel zips"

This reverts commit 09024c5c9ec87f730b9ec35bc5e16eeb27069716.