remove myself as phycore/litekit Maintainer

I never acked a patch that adds me as phycore i.MX31 maintainer nor was
it me who pushed the patches, so remove myself from the maintainer list
so that other people do not longer wait for my ack.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

MAINTAINERS

@@ -539,11 +539,6 @@ Kshitij Gupta <kshitij@ti.com>
 	omap1510inn	ARM925T
 	omap1610inn	ARM926EJS
 
-Sascha Hauer <s.hauer@pengutronix.de>
-
-	imx31_litekit	i.MX31
-	imx31_phycore	i.MX31
-
 Grazvydas Ignotas <notasas@gmail.com>
 
 	omap3_pandora	ARM CORTEX-A8 (OMAP3xx SoC)