linux-firmware/i915: GuC firmware for Broxton v8.7

linux-firmware/i915: GuC firmware for Broxton v8.7

This update contains (since v7.6):
    1. Update parameter name (interface change).
    2. Fix for power impact issue.

7.6 contained since v 5.1:
    1. Add per engine preemption support in scheduler.
    2. Fix for Sleep Shared Area Pointer Validation.
    3. Fix for Golden Context init for Render only for Engine Reset.
    4. Fix for Forcewake Render check.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>