ASoC: fsl_xcvr: Use devm_platform_ioremap_resource_byname() to simplify code

In this function, devm_platform_ioremap_resource_byname() should be
suitable to simplify code.

Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20210302125002.23900-1-tangbin@cmss.chinamobile.com


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