CB-7190: Add browserify support in cordova-lib/cordova-cli

https://issues.apache.org/jira/browse/CB-7190
Isn't this already taken care of here:
https://github.com/surajpindoria/cordova-lib/blob/browserify/cordova-lib/src/plugman/plugman.js#L131

the browserify and non-browserify methods have the exact same signature, so we should be calling a generic 'prepare' method which could be either one.