i965/gen10: Implement WaSampleOffsetIZ workaround

There are few other (duplicate) workarounds which have similar recommendations:
WaFlushHangWhenNonPipelineStateAndMarkerStalled
WaCSStallBefore3DSamplePattern
WaPipeControlBefore3DStateSamplePattern

WaPipeControlBefore3DStateSamplePattern has some extra recommendations if
driver is using mid batch context restore. Ignoring it for now because We're
not doing mid-batch context restore in Mesa.

This workaround doesn't fix any of the piglit hangs we've seen
on CNL. But it might be fixing something we haven't tested yet.

V2: Use brw_load_register_imm32() to program CACHE_MODE_0.
    Get rid of brw_flush_gpu_caches().

V3: Make the workaround helper functions static.

Signed-off-by: Anuj Phogat <[email protected]>
Reviewed-by: Rafael Antognolli <[email protected]>
Reviewed-by :Nanley Chery <[email protected]>

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