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i965: Enable ARB_transform_feedback2 on Gen7+ if register writes work.
With Linux 3.12, register writes work on Ivybridge and Baytrail, but not
Haswell. That will be fixed in a future kernel revision, at which point
this extension will automatically be enabled.
v2: Use I915_GEM_DOMAIN_INSTRUCTION for the register read, and also
correctly set the writeable flag when mapping (caught by Eric).
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
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