imx: imx8mp: Add support for Polyhex Debix Model A SBC

Add support for the Polyhex Debix Model A SBC board.
It is an industrial grade single board computer based on
NXP's i.MX 8M Plus.
Currently supported interfaces are:
- Serial console
- Micro SD
- eQOS and FEC Ethernet

imx8mp-debix-model-a.dts is taken from Linux 6.3.

Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx8m/Kconfig b/arch/arm/mach-imx/imx8m/Kconfig
index 3d62d70..b802d5c 100644
--- a/arch/arm/mach-imx/imx8m/Kconfig
+++ b/arch/arm/mach-imx/imx8m/Kconfig
@@ -199,6 +199,13 @@
 	select ARCH_MISC_INIT
 	select SPL_CRYPTO if SPL
 
+config TARGET_IMX8MP_DEBIX_MODEL_A
+	bool "Polyhex i.MX8M Plus Debix Model A SBC"
+	select BINMAN
+	select IMX8MP
+	select IMX8M_LPDDR4
+	select SUPPORT_SPL
+
 config TARGET_IMX8MP_DH_DHCOM_PDK2
 	bool "DH electronics DHCOM Premium Developer Kit (2) i.MX8M Plus"
 	select BINMAN
@@ -384,6 +391,7 @@
 source "board/mntre/imx8mq_reform2/Kconfig"
 source "board/phytec/phycore_imx8mm/Kconfig"
 source "board/phytec/phycore_imx8mp/Kconfig"
+source "board/polyhex/imx8mp_debix_model_a/Kconfig"
 source "board/purism/librem5/Kconfig"
 source "board/ronetix/imx8mq-cm/Kconfig"
 source "board/technexion/pico-imx8mq/Kconfig"