OMAP: Move omap1510inn to Unmaintained / Orphaned

After removing omap1610inn for not building, move omap1510inn to
orphaned.  Also update boards.cfg to note it's part of the 'omap' SoC to
make sure the board is built more often and future breakage noticed
quicker.

Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>

MAINTAINERS

@@ -669,10 +669,6 @@ Igor Grinberg <grinberg@compulab.co.il>
 
 	cm-t35		ARM ARMV7 (OMAP3xx Soc)
 
-Kshitij Gupta <kshitij@ti.com>
-
-	omap1510inn	ARM925T
-
 Stefan Herbrechtsmeier <stefan@code.herbrechtsmeier.net>
 
 	dns325		ARM926EJS (Kirkwood SoC)
@@ -941,6 +937,9 @@ Sughosh Ganu <urwithsughosh@gmail.com>
 Unknown / orphaned boards:
  	Board		CPU	Last known maintainer / Comment
 .........................................................................
+
+	omap1510inn	ARM925T         Kshitij Gupta <kshitij@ti.com>
+
 	lubbock		xscale/pxa	Kyle Harris <kharris@nexus-tech.net> / dead address
 
 	imx31_phycore_eet i.MX31  Guennadi Liakhovetski <g.liakhovetski@gmx.de> / resigned