MAINTAINERS: Mark some staging directories as "Obsolete"

Several staging directories have TODO files that indicate a
subsystem will be removed in the future.

Using a status entry of "S:	Obsolete" helps indicate the
subsystem files should not be modified unnecessarily.

checkpatch also tests this setting and emits a warning that
the matching subsystem files should not be modified.

This might help avoid receiving patches that will be dropped.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -7314,7 +7314,7 @@ F:	drivers/tty/ipwireless/
 
 IPX NETWORK LAYER
 L:	netdev@vger.kernel.org
-S:	Odd fixes
+S:	Obsolete
 F:	include/uapi/linux/ipx.h
 F:	drivers/staging/ipx/
 
@@ -7323,7 +7323,7 @@ M:	Samuel Ortiz <samuel@sortiz.org>
 L:	irda-users@lists.sourceforge.net (subscribers-only)
 L:	netdev@vger.kernel.org
 W:	http://irda.sourceforge.net/
-S:	Maintained
+S:	Obsolete
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/sameo/irda-2.6.git
 F:	Documentation/networking/irda.txt
 F:	drivers/staging/irda/
@@ -9366,7 +9366,7 @@ F:	drivers/net/ethernet/natsemi/natsemi.c
 
 NCP FILESYSTEM
 M:	Petr Vandrovec <petr@vandrovec.name>
-S:	Odd Fixes
+S:	Obsolete
 F:	drivers/staging/ncpfs/
 
 NCR 5380 SCSI DRIVERS