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/MAINTAINERS b/MAINTAINERS
index 2050ae2..b172e1e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -601,8 +601,10 @@
 M:	Vasileios Bimpikas <vasileios.bimpikas@analog.com>
 M:	Utsav Agarwal <utsav.agarwal@analog.com>
 M:	Arturs Artamonovs <arturs.artamonovs@analog.com>
+L:	adsp-linux@analog.com
 S:	Supported
 T:	git https://github.com/analogdevicesinc/lnxdsp-u-boot
+F:	arch/arm/dts/sc5*
 F:	arch/arm/include/asm/arch-adi/
 F:	arch/arm/mach-sc5xx/
 F:	drivers/clk/adi/