MAINTAINERS: Switch a maintainer for drivers/staging/gasket

Todd Poynor takes over for John Joseph.
Signed-off-by: John Joseph <jnjoseph@google.com>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -6059,7 +6059,7 @@ F:	Documentation/gcc-plugins.txt
 
 GASKET DRIVER FRAMEWORK
 M:	Rob Springer <rspringer@google.com>
-M:	John Joseph <jnjoseph@google.com>
+M:	Todd Poynor <toddpoynor@google.com>
 M:	Ben Chan <benchan@chromium.org>
 S:	Maintained
 F:	drivers/staging/gasket/