MAINTAINERS: Add SBUS driver path to sparc entry.

Signed-off-by: David S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -5317,6 +5317,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6.git
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6.git
 S:	Maintained
 F:	arch/sparc/
+F:	drivers/sbus
 
 SPARC SERIAL DRIVERS
 M:	"David S. Miller" <davem@davemloft.net>