drm/i915/lnl: Remove watchdog timers for PSR

Watchdog timers for Lunarlake HW were removed for PSR/PSR2
The patch removes the use of these timers from the driver code.

BSpec: 69895

v2: Reword commit message (Ville)
    Drop HPD mask from LNL (Ville)
    Revise masking logic (Jouni)
v3: Revise commit message (Ville)
    Revert HPD mask removal as irrelevant for this patch (Ville)

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231010095233.590613-1-mika.kahola@intel.com