spi: rockchip: Stop spi slave dma receiver when cs inactive

spi: rockchip: Stop spi slave dma receiver when cs inactive

[ Upstream commit 869f2c94db92f0f1d6acd0dff1c1ebb8160f5e29 ]

The spi which's version is higher than ver 2 will automatically
enable this feature.

If the length of master transmission is uncertain, the RK spi slave
is better to automatically stop after cs inactive instead of waiting
for xfer_completion forever.

Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
Link: https://lore.kernel.org/r/20220216014028.8123-4-jon.lin@rock-chips.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>