drm/i915: More use of the cached LRC state

Since:

commit 82352e908acd36d7244c75a008c9f27a2ced44d5
Author: Tvrtko Ursulin <[email protected]>
Date:   Fri Jan 15 17:12:45 2016 +0000

    drm/i915: Cache LRC state page in the context

and:

commit 0eb973d31d0aadb6bc801fd6d796afecbbfc3d5b
Author: Tvrtko Ursulin <[email protected]>
Date:   Fri Jan 15 15:10:28 2016 +0000

    drm/i915: Cache ringbuffer GTT VMA

We can also remove the ring buffer start updates on every
context update since the address will not change for the
duration of the LRC pin.

For GuC we can remove the update altogether because it
only cares about the ring buffer start.

Signed-off-by: Tvrtko Ursulin <[email protected]>
Cc: Alex Dai <[email protected]>
Cc: Dave Gordon <[email protected]>
Cc: Chris Wilson <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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