Check the fb size against the correct CRTC viewport for stereo modes

Damien Lespiau
2013-09-23T14:57:38Z

I've sent this 2 patches separately from the main stereo series so we can have
the usual rounds of review without having to resend the full 20+ patches. Once
that last bit has been reviewed as well, I'll send a consolidated series that
will be a serious candidate for merging.

--
Damien