MAINTAINERS: update my email address

I am no longer an employee at AIS. Use my personal email address
instead.

Signed-off-by: Nick Rosbrook <rosbrookn@gmail.com>
Reviewed-by: George Dunlap <george.dunlap@citrix.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>

MAINTAINERS

@@ -302,7 +302,7 @@ F:	tools/debugger/gdbsx/
 
 GOLANG BINDINGS
 M:	George Dunlap <george.dunlap@citrix.com>
-M:     Nick Rosbrook <rosbrookn@ainfosec.com>
+M:	Nick Rosbrook <rosbrookn@gmail.com>
 S:	Maintained
 F:	tools/golang