Drop drm-i915-hush-check-crtc-state.patch
    
    This patch from 2013 stops the i915 driver from spitting out WARNs in
    some cases, but nearly the same thing can be achieved with the
    ``verbose_state_checks=false`` module option added in 2014. With the
    module setting the issue results in a log message at error level rather
    than the debug level set by this patch. However, it's not known if this
    is still a common issue. It seems worth the cost of (maybe) a few more
    bug reports about new error-level logs to drop the patch.
    
    To start with, we're going to leave ``verbose_state_checks=true`` (the
    default), but if we run into a lot of WARNs we will turn it off.