You can comply with the GPL or you can comply with the original license. Neither of which allows you to BSD license the code, if in your use of the code you violate copyright. GPL is very specific in that every copy of GPL'd code must be in turn GPL'd. Re-Releasing code of BSD breaks that chain, and thus isn't allowed.

If you don't like what licenses are available to you, then you negotiate a new one or you don't use it. Every vendor knows that when they modify Linux and embed it, their changes to Linux must be available. No vendor has done more than pay lip service to challenging this aspect of the GPL, the reason being, is the strength of copyright.

Sure, if Google were happy to comply with the GPL. But they're not.