drm/i915/guc: Limit number of scratch registers used for H2G

We wrongly assumed that GuC is only using last scratch register
for G2H messages, but in fact it is also using register [14] to
report sleep state status. Remove that register from our H2G
send registers pool.

v2: No message from host to GuC uses more than 8 registers and
the GuC FW itself uses an 8-element array to store the H2G message,
so we may reduce our send array to just 8 registers (Daniele)
v3: use explicit define (Daniele)
v4: and explicit comment (Daniele)

Signed-off-by: Michal Wajdeczko <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Chris Wilson <[email protected]>
Reviewed-by: Daniele Ceraolo Spurio <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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