arch/tile: update MAINTAINERS email to EZchip

EZchip Semiconductor closed the acquisition of Tilera Corp
last week, and tilera.com email addresses are now ezchip.com.

http://www.ezchip.com/pr_141106.htm

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>

MAINTAINERS

@@ -9362,7 +9362,7 @@ F:	include/uapi/linux/tipc*.h
 F:	net/tipc/
 
 TILE ARCHITECTURE
-M:	Chris Metcalf <cmetcalf@tilera.com>
+M:	Chris Metcalf <cmetcalf@ezchip.com>
 W:	http://www.tilera.com/scm/
 S:	Supported
 F:	arch/tile/