ASoC: fsl_sai: add IRQF_SHARED

The LS1028A SoC uses the same interrupt line for adjacent SAIs. Use
IRQF_SHARED to be able to use these SAIs simultaneously.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Acked-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20191128223802.18228-1-michael@walle.cc


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