mips: octeon: dts: Add Octeon 3 cn73xx base dtsi file

This patch adds the base dtsi file for the Octeon 3 cn73xx SoC.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index bde8530..6316c6c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -775,6 +775,7 @@
 S:	Maintained
 F:	arch/mips/mach-octeon/
 F:	arch/mips/include/asm/arch-octeon/
+F:	arch/mips/dts/mrvl,cn73xx.dtsi
 
 MMC
 M:	Peng Fan <peng.fan@nxp.com>