i2c: rcar: make sure irq is not threaded on Gen2 and earlier
Ensure this irq runs as fast as possible. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
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