MAINTAINERS: update for SM7XX driver

add myself and Teddy Wang as the Maintainer of the
SM7XX FRAME BUFFER DRIVER.
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -9179,6 +9179,14 @@ L:	linux-wireless@vger.kernel.org
 S:	Maintained
 F:	drivers/staging/rtl8723au/
 
+STAGING - SILICON MOTION SM7XX FRAME BUFFER DRIVER
+M:	Sudip Mukherjee <sudipm.mukherjee@gmail.com>
+M:	Teddy Wang <teddy.wang@siliconmotion.com>
+M:	Sudip Mukherjee <sudip@vectorindia.org>
+L:	linux-fbdev@vger.kernel.org
+S:	Maintained
+F:	drivers/staging/sm7xxfb/
+
 STAGING - SLICOSS
 M:	Lior Dotan <liodot@gmail.com>
 M:	Christopher Harrer <charrer@alacritech.com>