sh: Add support for ecovec board

The ecovec board has SH7724, 256MB DDR2-SDRAM, USB,
Ethernet, and more.

This patch supports the following functions:
	- 256MB DDR2-SDRAM
	- USB
	- I2C
	- Ethernet

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index ad1b62f..689c766 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1054,6 +1054,7 @@
 	RSK7203		SH7203
 	AP325RXA	SH7723
 	SHMIN		SH7706
+	ECOVEC		SH7724
 
 Mark Jonas <mark.jonas@de.bosch.com>