board: davinci: Update OMAPL138_LCDK maintainer

As per the email discussion[0], add myself as a maintainer to
OMAPL138_LCDK and drop Peter's entry.

[0] http://u-boot.10912.n7.nabble.com/OMAP-L138-LCDK-giving-up-maintainership-td394211.htmlSigned-off-by: NLokesh Vutla <lokeshvutla@ti.com>

board/davinci/da8xxevm/MAINTAINERS

@@ -8,7 +8,7 @@ F:	configs/da850evm_nand_defconfig
 F:	configs/da850evm_direct_nor_defconfig
 
 OMAPL138_LCDK BOARD
-M:	Peter Howard <phoward@gme.net.au>
+M:	Lokesh Vutla <lokeshvutla@ti.com>
 S:	Maintained
 F:	include/configs/omap1l38_lcdk.h
 F:	configs/omapl138_lcdk_defconfig