drm/i915/gsc: allocate extended operational memory in LMEM

drm/i915/gsc: allocate extended operational memory in LMEM

GSC requires more operational memory than available on chip.
Reserve 4M of LMEM for GSC operation. The memory is provided to the
GSC as struct resource to the auxiliary data of the child device.

Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-16-tomas.winkler@intel.com
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>