west: sign: add support for NXP i.MX8QXP board

Add support for signing i.MX8QXP SOF with Zephyr images with rimage.

i.MX8QXP and i.MX8QM have the same board-level definitions,
so we use the generic imx8.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
1 file changed