package/freescale-ele-imx: install with original filename

U-Boot expects the original filename (E.G. mx93a1-ahab-container.img rather
than ahab-container.img), so install into BINARIES_DIR with the original
filename and add a ahab-container.img symlink similar to how it is done in
firmware-imx.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>