android: boot: update android_image_get_data to support v3, v4

Since boot image header version 3 and 4 introduced vendor boot image,
use the following functions to fill the generic android
structure : andr_image_data:

 - android_boot_image_v3_v4_parse_hdr()
 - android_vendor_boot_image_v3_v4_parse_hdr()

Update android_image_get_data() to support v3 and v4

Signed-off-by: Safae Ouajih <souajih@baylibre.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>