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_ptc_ek/MAINTAINERS b/board/atmel/sama5d2_ptc_ek/MAINTAINERS
index 3c7b7f5..9f82d9a 100644
--- a/board/atmel/sama5d2_ptc_ek/MAINTAINERS
+++ b/board/atmel/sama5d2_ptc_ek/MAINTAINERS
@@ -1,5 +1,5 @@
 SAMA5D2 PTC EK BOARD
-M:	Wenyou Yang <wenyou.yang@microchip.com>
+M:	Eugen Hristev <eugen.hristev@microchip.com>
 M:	Ludovic Desroches <ludovic.desroches@microchip.com>
 S:	Maintained
 F:	board/atmel/sama5d2_ptc_ek/