Add ext4 image tool

mkext4_image: ext4 fs tool to generate rootfs ext4 image file for
fastboot update on sd card.

Signed-off-by: Max Liao <liaops@embedinfo.com>
Add recovery to sama5d3

Set TARGET_NO_KERNEL to false
Add recovery.fstab
Add empty kernel image file
Add tool mk_updatepackage to generate update package
Modify ubi fs tool to generete empty cache ubi image

Signed-off-by: Max Liao <liaops@embedinfo.com>
Modify update script

Use macro to replace hard code path.
Replace ANDROID_PATCH to ANDROID_PATH.

Signed-off-by: Max Liao <liaops@embedinfo.com>
Update mkubi_image and mksd_image scripts

Use macro to replace hard code path.

Signed-off-by: Max Liao <liaops@embedinfo.com>
Enable recovery mode for sama5d3isi

Set TARGET_NO_KERNEL to false
Add kernel image file item to PRODUCT_COPY_FILES
Add recovery.fstab

Signed-off-by: Max Liao <liaops@embedinfo.com>