[PATCH 3/5] drm/panfrost: Add a no execute flag for BO allocations

[Alyssa Rosenzweig]

> Seems like almost 4GB executable
> buffer should be enough for anyone(TM).

(TM) indeed. For stats, Panfrost right now uses a single 16MB shader
buffer per context and never reallocates.

I have never seen it run out of space, not even once on a conformance
test.

Mali shader binaries are small (a HUGE shader would be several
kilobytes!!!) so... honestly if you're doing more than 32MB executable
that's super raising eyebrows.