spi: rockchip: remove xfer_completion from rockchip_spi

xfer_completion isn't been used anywhere, so it can be
removed.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Shawn Lin 2016-02-16 11:23:32 +08:00 • committed by Mark Brown
commit 23366a02bf