imx: hab: extend hab_auth_img to calculate ivt_offset
Current implementation of hab_auth_img command needs ivt_offset to
authenticate the image. But ivt header is placed at the end of image
date after padding.
This leaves the usage of hab_auth_img command to fixed size or static
offset for ivt header. New function "get_image_ivt_offset" is introduced
to find the ivt offset during runtime. The case conditional check in this
function is same as boot_get_kernel in common/bootm.c
With this variable length image e.g. FIT image with any random size can
have IVT at the end and ivt_offset option can be left optional
Can be used as "hab_auth_img $loadaddr $filesize" from u-boot script
Signed-off-by: Parthiban Nallathambi <pn@denx.de>
Reviewed-by: Breno Lima <breno.lima@nxp.com>