Make a GEM debug failure fatal

configname: CONFIG_DRM_I915_DEBUG_GEM_ONCE

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>drm/i915 Debugging
└─>Make a GEM debug failure fatal
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
During development, we often only want the very first failure
as that would otherwise be lost in the deluge of subsequent
failures. However, more casual testers may not want to trigger
a hard BUG_ON and hope that the system remains sufficiently usable
to capture a bug report in situ.

Recommended for driver developers only.

If in doubt, say "N".