i.MX95 uses binman to invoke mkimage to create image container. 2 image
containers are needed currently. The first one is composed of
ahab-container.img, LPDDR firmware images, OEI images, System Manager
image and u-boot-spl.bin. The second one is consisted of ARM Trusted
firmware and u-boot.bin.

Because DDR OEI image and LPDDR firmware images have to be packaged
together and named as m33-oei-ddrfw.bin by binman, so imx9_image.sh does
not check if m33-oei-ddrfw.bin exists.

When using "make imx95_19x19_evk_defconfig; make", imx9_image.sh will
delete the line for u-boot.bin in container.cfg. In fact, binman is
always called after the u-boot.bin is built, so imx9_image.sh does not
check if u-boot.bin exists.

Signed-off-by: Alice Guo <alice.guo@nxp.com>

If the optional `tee.bin` OP-TEE binary is missing, the image will still be
functional. Adapt the warning message accordingly.

Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>

Add dedicated Makefile targets for the i.MX93 and a new imx93-u-boot.dtsi
device-tree to create binman images.

Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>