driver core: the development tree has switched to git

So change the MAINTAINERS file to show where the tree now is at.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

MAINTAINERS

@@ -2051,7 +2051,7 @@ F:	Documentation/blockdev/drbd/
 
 DRIVER CORE, KOBJECTS, DEBUGFS AND SYSFS
 M:	Greg Kroah-Hartman <gregkh@suse.de>
-T:	quilt kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6.git
 S:	Supported
 F:	Documentation/kobject.txt
 F:	drivers/base/