ASoC: fsl_asrc: Use dev_name() for registering the irq

The 'name' array is currently stored inside the fsl_asrc private structure only
for registering the interrupt name.

This can be simplified by registering it with dev_name() instead.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>