drm/i915/gsc: add slow_firmware flag to the gsc device definition

Add slow_firmware flag to the gsc device definition
and pass it to mei auxiliary device, this instructs
the driver to use longer operation timeouts.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907215113.1596567-5-tomas.winkler@intel.com


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