drm/i915: Disable THP until we have a GPU read BW W/A

We seem to be missing some W/A for 2M pages and are getting
a hit on raw GPU read bandwidths (even 30%) even though the
GPU write bandwidths improve (even 10%).

For now, disable THP, which is our only practical source of
2M pages until we have a W/A for the issue.

v2:
- Be explicit that we talk about GPU bandwidths (Eero)
- s/deny/never/ because that's why (Chris)

Reported-by: Valtteri Rantala <[email protected]>
Fixes: b901bb89324a ("drm/i915/gemfs: enable THP")
Signed-off-by: Joonas Lahtinen <[email protected]>
Cc: Matthew Auld <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Valtteri Rantala <[email protected]>
Cc: Eero Tamminen <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Tested-by: Valtteri Rantala <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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