board: gateworks: venice: add imx8mm-gw7901 support

The Gateworks GW7901 is an ARM based single board computer (SBC)
featuring:
 - i.MX8M Mini SoC
 - LPDDR4 DRAM
 - eMMC FLASH
 - SPI FRAM
 - Gateworks System Controller (GSC)
 - Atmel ATECC Crypto Authentication
 - USB 2.0
 - Microchip GbE Switch
 - Multiple multi-protocol RS232/RS485/RS422 Serial ports
 - onboard 802.11ac WiFi / BT
 - microSD socket
 - miniPCIe socket with PCIe, USB 2.0 and dual SIM sockets
 - Wide range DC power input
 - 802.3at PoE

To add support for this board:
 - add dts from Linux (accepted for v5.14)
 - add SPL PMIC config

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 59d8078..db3891e 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -865,6 +865,7 @@
 	imx8mm-venice-gw71xx-0x.dtb \
 	imx8mm-venice-gw72xx-0x.dtb \
 	imx8mm-venice-gw73xx-0x.dtb \
+	imx8mm-venice-gw7901.dtb \
 	imx8mm-verdin.dtb \
 	phycore-imx8mm.dtb \
 	imx8mn-ddr4-evk.dtb \