MAINTAINERS: fix git tree url for musb module

Commit 3b24351 ("MAINTAINERS: drop OMAP USB and MUSB
maintainership") switched the maintainer for musb module, but didn't
update the git tree location.

Delete the git tree information, since the current maintainer doesn't
have a public tree.

Reported-by: Jonathan Liu <[email protected]>
Signed-off-by: Bin Liu <[email protected]>
Acked-by: Felipe Balbi <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: liubiin

MAINTAINERS

@@ -9213,7 +9213,6 @@ F:	include/linux/isicom.h
 MUSB MULTIPOINT HIGH SPEED DUAL-ROLE CONTROLLER
 M:	Bin Liu <[email protected]>
 L:	[email protected]
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git
 S:	Maintained
 F:	drivers/usb/musb/