arm: dts: Support SC573-EZKIT

Adds minimal device tree for Analog Devices' SC573-EZKIT board and
common files for the SC57x/SC5xx family.

This also adds all sc5* devicetrees to ARM SC5XX in MAINTAINERS, and
adds the ADSP Linux mailing list as the list for ARM SC5XX.

Co-developed-by: Greg Malysa <greg.malysa@timesys.com>
Signed-off-by: Greg Malysa <greg.malysa@timesys.com>
Co-developed-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Signed-off-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Signed-off-by: Oliver Gaskell <Oliver.Gaskell@analog.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 2d931c2..d219490 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -1258,6 +1258,8 @@
 					imx8mm-cl-iot-gate-ied-tpm0.dtbo \
 					imx8mm-cl-iot-gate-ied-tpm1.dtbo
 
+dtb-$(CONFIG_TARGET_SC573_EZKIT) += sc573-ezkit.dtb
+
 ifneq ($(CONFIG_TARGET_IMX8MP_RSB3720A1_4G)$(CONFIG_TARGET_IMX8MP_RSB3720A1_6G),)
 dtb-y += imx8mp-rsb3720-a1.dtb
 endif