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/at91sam9x5ek/MAINTAINERS b/board/atmel/at91sam9x5ek/MAINTAINERS
index 5fea489..51d2237 100644
--- a/board/atmel/at91sam9x5ek/MAINTAINERS
+++ b/board/atmel/at91sam9x5ek/MAINTAINERS
@@ -1,5 +1,5 @@
 AT91SAM9X5EK BOARD
-M:	Bo Shen <voice.shen@atmel.com>
+M:	Eugen Hristev <eugen.hristev@microchip.com>
 S:	Maintained
 F:	board/atmel/at91sam9x5ek/
 F:	include/configs/at91sam9x5ek.h