This is allowed according to the rules http://www.advancedcustomfields.com/resources/including-acf-in-a-plugin-theme/
You can include the ACF PRO plugin within a premium theme/plugin as long as it is made clear in the copyright / information that the ACF PRO files are not to be used or distributed outside of the premium theme/plugin.
Now, just my personal opinion but if you search you’ll find that other share it. Bundling plugins is generally a bad idea because it makes it extremely difficult to update the bundled plugins, or even know that they need to be updated for the person using you’re plugin.
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