ASoC: sun4i-i2s: RX and TX counter registers are swapped

The RX and TX counters registers offset have been swapped, fix that.

Fixes: fa7c0d13 ("ASoC: sunxi: Add Allwinner A10 Digital Audio driver")
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://lore.kernel.org/r/8b26477560ad5fd8f69e037b167c5e61de5c26a3.1566242458.git-series.maxime.ripard@bootlin.com


Signed-off-by: Mark Brown <broonie@kernel.org>