drm/i915: Use managed allocations for extra uncore objects

We're slowly transitioning the init-time kzalloc's of the driver over to
DRM-managed allocations; let's make sure the uncore objects allocated
for non-root GTs are thus allocated.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220906234934.3655440-4-matthew.d.roper@intel.com


Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>