drm/i915/gt: Whitelist COMMON_SLICE_CHICKEN1 for UMD access.

As part of the recommended tuning setting, whitelist COMMON_SLICE_CHICKEN1
for MTL/ARL and DG2.

The UMD will selectively enable or disable specific bits of the
register based on the type of workload and its requirements.

v2: Remove the KMD par of enabling specific bits(Matt R)

Bspec: 68331
Signed-off-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240825121156.2498810-1-dnyaneshwar.bhadane@intel.com