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/board/polyhex/imx8mp_debix_model_a/Kconfig b/board/polyhex/imx8mp_debix_model_a/Kconfig
new file mode 100644
index 0000000..3ebb6bc
--- /dev/null
+++ b/board/polyhex/imx8mp_debix_model_a/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_IMX8MP_DEBIX_MODEL_A
+
+config SYS_BOARD
+	default "imx8mp_debix_model_a"
+
+config SYS_VENDOR
+	default "polyhex"
+
+config SYS_CONFIG_NAME
+	default "imx8mp_debix_model_a"
+
+config IMX_CONFIG
+	default "board/polyhex/imx8mp_debix_model_a/imximage-8mp-lpddr4.cfg"
+
+endif