drm/i915/gt: Update PMINTRMSK holding fw

If we use a non-forcewaked write to PMINTRMSK, it does not take effect
until much later, if at all, causing a loss of RPS interrupts and no GPU
reclocking, leaving the GPU running at the wrong frequency for long
periods of time.

Reported-by: Francisco Jerez <[email protected]>
Suggested-by: Francisco Jerez <[email protected]>
Fixes: 35cc7f32c298 ("drm/i915/gt: Use non-forcewake writes for RPS")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Francisco Jerez <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Cc: Andi Shyti <[email protected]>
Reviewed-by: Mika Kuoppala <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Reviewed-by: Francisco Jerez <[email protected]>
Cc: <[email protected]> # v5.6+
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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