arm: imx: Add support for Google's Coral Dev Board

Add initial support for Google's Coral Dev Board based on i.MX8MQ.

https://coral.ai/products/dev-board

The Phanbell naming has been used here to match the naming convention
used in Google's U-Boot source tree:

https://coral.googlesource.com/uboot-imx/

Co-developed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Alifer Moraes <alifer.wsdm@gmail.com>
Tested-by: Marco Franchi <marcofrk@gmail.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 2c123bd..312e6e3 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -733,6 +733,7 @@
 	imx8mm-verdin.dtb \
 	imx8mn-ddr4-evk.dtb \
 	imx8mq-evk.dtb \
+	imx8mq-phanbell.dtb \
 	imx8mp-evk.dtb
 
 dtb-$(CONFIG_ARCH_IMXRT) += imxrt1050-evk.dtb \