drm/i915/lttpr: Enable Extended Wake Timeout

drm/i915/lttpr: Enable Extended Wake Timeout

Usually retimers take around 30 to 40ms to exit all devices from
sleep state. Extended wake timeout mechanism helps to give
that additional time.

--v2
-Grant the requested time only if greater than 1ms [Arun/Jani]
-Reframe commit message [Arun]

--v3
-Move the function to drm_core [Dmitry/Jani]

Spec: DP v2.1 Section 3.6.12.3
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250122053358.1545039-4-suraj.kandpal@intel.com