board: gateworks: venice: add imx8mm-gw7902 support

The GW7902 is based on the i.MX 8M Mini / Nano SoC featuring:
- LPDDR4 DRAM
- eMMC FLASH
- Gateworks System Controller
- LTE CAT M1 modem
- USB 2.0 HUB
- M.2 Socket with USB2.0, PCIe, and dual-SIM
- IMX8M FEC
- PCIe based GbE
- RS232/RS485/RS422 serial transceiver
- GPS
- CAN bus
- WiFi / Bluetooth
- MIPI header (DSI/CSI/GPIO/PWM/I2S)
- PMIC

Do the following to add support for it:
- add dts
- add PMIC config

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 537c96b..bec349f 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -870,6 +870,7 @@
 	imx8mm-venice-gw72xx-0x.dtb \
 	imx8mm-venice-gw73xx-0x.dtb \
 	imx8mm-venice-gw7901.dtb \
+	imx8mm-venice-gw7902.dtb \
 	imx8mm-verdin.dtb \
 	phycore-imx8mm.dtb \
 	imx8mn-ddr4-evk.dtb \