drm/i915: Move rps.hw_lock to dev_priv and s/hw_lock/pcu_lock

drm/i915: Move rps.hw_lock to dev_priv and s/hw_lock/pcu_lock

In order to separate GT PM related functionality into new structure
we are updating rps structure. hw_lock in it is used for display
related PCU communication too hence move it to dev_priv.

Signed-off-by: Sagar Arun Kamble <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Radoslaw Szwichtenberg <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Acked-by: Imre Deak <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]