remove myself as a maintainer of several ARM boards

Since I haven't been actively maintaining these boards for a long while,
keeping myself as their maintainer makes no sense.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>

MAINTAINERS

@@ -677,12 +677,6 @@ Sergey Lapin <slapin@ossfans.org>
 
 	afeb9260	ARM926EJS (AT91SAM9260 SoC)
 
-Guennadi Liakhovetski <g.liakhovetski@gmx.de>
-
-	imx31_phycore_eet	i.MX31
-	mx31ads			i.MX31
-	SMDK6400		S3C6400
-
 Nishanth Menon <nm@ti.com>
 
 	omap3_sdp3430	ARM CORTEX-A8 (OMAP3xx SoC)
@@ -825,6 +819,10 @@ Unknown / orphaned boards:
 	ixdp425		xscale	Kyle Harris <kharris@nexus-tech.net> / dead address
 	lubbock		xscale	Kyle Harris <kharris@nexus-tech.net> / dead address
 
+	imx31_phycore_eet i.MX31  Guennadi Liakhovetski <g.liakhovetski@gmx.de> / resigned
+	mx31ads		  i.MX31  Guennadi Liakhovetski <g.liakhovetski@gmx.de> / resigned
+	SMDK6400	  S3C6400 Guennadi Liakhovetski <g.liakhovetski@gmx.de> / resigned
+
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