Revert "drm/i915/tgl: Implement Wa_1406941453"

Our sanitychecks indicate that while this register is context
saved/restore, the HW does not preserve this bit within the register --
it likely doesn't exist, or one of those mythical bits that the
architects insist does something despite all appearances to the
contrary.

For reference, SAMPLER_MODE is already in i915_reg.h as
GEN10_SAMPLER_MODE and is being setup in icl_ctx_workarounds_init() as
opposed to the chosen location here of rcs_engine_wa_init).

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111754
Fixes: 7f0cc34b5349 ("drm/i915/tgl: Implement Wa_1406941453")
Testcase: igt/i915_selftest/live_workarounds
Signed-off-by: Chris Wilson <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Cc: Stuart Summers <[email protected]>
Cc: Radhakrishna Sripada <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Acked-by: Lucas De Marchi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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