ARM: add the imx31_phycore_eet target to MAINTAINERS

imx31_phycore_eet is a variant of the imx31_phycore board with a few
extensions, which justifies a separate entry in the MAINTAINERS list,
whereas normally all entries sharing a single configuration file and a
board/ directory have only one entry in MAINTAINERS.

Reported-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Guennadi Liakhovetski <lg@denx.de>

MAINTAINERS

@@ -568,8 +568,9 @@ Prakash Kumar <prakash@embedx.com>
 
 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 
-	mx31ads		i.MX31
-	SMDK6400	S3C6400
+	imx31_phycore_eet	i.MX31
+	mx31ads			i.MX31
+	SMDK6400		S3C6400
 
 Nishanth Menon <nm@ti.com>