Always insert extra checks around mmio access by default

configname: CONFIG_DRM_I915_DEBUG_MMIO

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>drm/i915 Debugging
└─>Always insert extra checks around mmio access by default
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
By default, always enables the extra sanity checks (extra register
reads) around every mmio (register) access that will slow the system
down. This sets the default value of i915.mmio_debug to -1 and can
be overridden at module load.

Recommended for driver developers only.

If in doubt, say "N".

depends
CONFIG_DRM_I915
CONFIG_EXPERT
CONFIG_HAS_IOMEM

is depended by
CONFIG_DRM_I915_DEBUG