drm/i915: Disable gpu relocations

Media userspace was the last userspace to still use them, and they
converted now too:

https://github.com/intel/media-driver/commit/144020c37770083974bedf59902b70b8f444c799

This means no reason anymore to make relocations faster than they've
been for the first 9 years of gem. This code was added in

commit 7dd4f6729f9243bd7046c6f04c107a456bda38eb
Author: Chris Wilson <[email protected]>
Date:   Fri Jun 16 15:05:24 2017 +0100

    drm/i915: Async GPU relocation processing

Furthermore there's pretty strong indications it's buggy, since the
code to use it by default as the only option had to be reverted:

commit ad5d95e4d538737ed3fa25493777decf264a3011
Author: Dave Airlie <[email protected]>
Date:   Tue Sep 8 15:41:17 2020 +1000

    Revert "drm/i915/gem: Async GPU relocations only"

This code just disables gpu relocations, leaving the garbage
collection for later patches and more importantly, much less confusing
diff. Also given how much headaches this code has caused in the past,
letting this soak for a bit seems justified.

Acked-by: Dave Airlie <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Jon Bloomfield <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: "Thomas Hellström" <[email protected]>
Cc: Matthew Auld <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Jason Ekstrand <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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