ASoC: rockchip: i2s: Fix error code when fail to read I2S_CLR

Add the error code '-EBUSY' when fail to read I2S_CLR
in rockchip_snd_rxctrl() and rockchip_snd_txctrl()

Fixes: 44f362c2 ("ASoC: rockchip: i2s: switch BCLK to GPIO")
Signed-off-by: Judy Hsiao <judyhsiao@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Link: https://lore.kernel.org/r/20220701021427.3120549-1-judyhsiao@chromium.org


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