imx93_frdm: Add initial board support
Add the initial board support for the NXP i.MX93 FRDM board:
https://www.nxp.com/design/design-center/development-boards-and-designs/frdm-i-mx-93-development-board:FRDM-IMX93
Based on the NXP U-Boot code.
There were attempts to upstream the board devicetree, but it has not been
accepted upstream yet:
https://lore.kernel.org/linux-arm-kernel/
20250526-fpg-nxp-imx93-frdm-v2-2-
e5ad0efaec33@pengutronix.de/
Once it reaches upstream, we can switch to OF_UPSTREAM.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>