ASoC: fsl_micfil: drop support for undocumented property

The "fsl,shared-interrupt" property is undocumented and unnecessary.
Just pass IRQF_SHARED unconditionally.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://lore.kernel.org/r/20220414162249.3934543-20-s.hauer@pengutronix.de


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