arm : Atmel : add at91sam9x5ek board support

Add at91sam9x5ek board support, this board support the following SoCs
  AT91SAM9G15, AT91SAM9G25, AT91SAM9G35, AT91SAM9X25, AT91SAM9X35

Using at91sam9x5ek_nandflash to configure for the board
Now only supports NAND with software ECC boot up

Signed-off-by: Bo Shen <voice.shen@atmel.com>
[move MAINTAINERS entry to right place]
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 9b20574..74557be 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -875,6 +875,9 @@
 	actux4		xscale/ixp
 	dvlhost		xscale/ixp
 
+Bo Shen <voice.shen@atmel.com>
+	at91sam9x5ek		ARM926EJS (AT91SAM9G15,G25,G35,X25,X35 SoC)
+
 Nick Thompson <nick.thompson@gefanuc.com>
 
 	da830evm	ARM926EJS (DA830/OMAP-L137)