MAINTAINERS,board/siemens: update maintainer

Signed-off-by: Samuel Egli <samuel.egli@siemens.com>
Acked-by: Roger Meier <r.meier@siemens.com>
Cc: Heiko Schocher <hs@denx.de>
diff --git a/board/siemens/pxm2/MAINTAINERS b/board/siemens/pxm2/MAINTAINERS
index fa734c9..dc02fe8 100644
--- a/board/siemens/pxm2/MAINTAINERS
+++ b/board/siemens/pxm2/MAINTAINERS
@@ -1,5 +1,5 @@
 PXM2 BOARD
-M:	Roger Meier <r.meier@siemens.com>
+M:	Samuel Egli <samuel.egli@siemens.com>
 S:	Maintained
 F:	board/siemens/pxm2/
 F:	include/configs/pxm2.h