MAINTAINERS: add drivers/char/hvc_tile.c as maintained by tile

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

MAINTAINERS

@@ -5827,6 +5827,7 @@ M:	Chris Metcalf <cmetcalf@tilera.com>
 W:	http://www.tilera.com/scm/
 S:	Supported
 F:	arch/tile/
+F:	drivers/char/hvc_tile.c
 
 TLAN NETWORK DRIVER
 M:	Samuel Chessman <chessman@tux.org>