MAINTAINERS: Add rcy@google.com as maintainer for drivers/staging/gasket

After consultation with Todd Poynor and Jesse Barnes, I am
adding myself as a maintainer for drivers/staging/gasket
Signed-off-by: Richard C Yeh <rcy@google.com>
Acked-by: Todd Poynor <toddpoynor@google.com>
Link: https://lore.kernel.org/r/20200423191504.149922-1-rcy@google.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -7033,6 +7033,7 @@ GASKET DRIVER FRAMEWORK
 M:	Rob Springer <rspringer@google.com>
 M:	Todd Poynor <toddpoynor@google.com>
 M:	Ben Chan <benchan@chromium.org>
+M:	Richard Yeh <rcy@google.com>
 S:	Maintained
 F:	drivers/staging/gasket/