drm/i915/uc: Rename uC firmware init/fini functions

he uC firmware init function is called during GuC/HuC init early phases.
 Rename to include "_early" and properly reflect which phase we are at.

The uC firmware fini function is cleaning up the state set/created on
firmware fetch. Replace "_fini" with "_cleanup_fetch".

v2: also rename uC fw fini function

Signed-off-by: Fernando Pacheco <fernando.pacheco@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190419230015.18121-2-fernando.pacheco@intel.com