MAINTAINERS: at91: update entry for at91 boards

Updated the maintainership for the at91 boards.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
diff --git a/board/atmel/sama5d2_xplained/MAINTAINERS b/board/atmel/sama5d2_xplained/MAINTAINERS
index 5b599d8..08de5bb 100644
--- a/board/atmel/sama5d2_xplained/MAINTAINERS
+++ b/board/atmel/sama5d2_xplained/MAINTAINERS
@@ -1,5 +1,5 @@
 SAMA5D2 XPLAINED BOARD
-M:	Wenyou Yang <wenyou.yang@atmel.com>
+M:	Eugen Hristev <eugen.hristev@microchip.com>
 S:	Maintained
 F:	board/atmel/sama5d2_xplained/
 F:	include/configs/sama5d2_xplained.h