reset: imx8mp-audiomix: Introduce active_low configuration option

reset: imx8mp-audiomix: Introduce active_low configuration option

For EARC and EARC PHY the reset happens when clearing the reset bits.
Refactor assert/deassert function in order to take into account the
active_low configuration option.

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20250311085812.1296243-7-daniel.baluta@nxp.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>