drm/i915/huc: Update TGL and friends to HuC 7.9.3

A new HuC is available for TGL and compatible platforms, so switch to
using it.

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210626004522.1699509-2-John.C.Harrison@Intel.com