ASoC: fsl: fix fsl_spdif.c build errors

Fix build errors in sound/soc/fsl/fsl_spdif.c by selecting BITREVERSE.
Fixes these build errors:

sound/built-in.o: In function `spdif_write_channel_status':
fsl_spdif.c:(.text+0xbe39d): undefined reference to `byte_rev_table'
fsl_spdif.c:(.text+0xbe3a8): undefined reference to `byte_rev_table'
fsl_spdif.c:(.text+0xbe3be): undefined reference to `byte_rev_table'
fsl_spdif.c:(.text+0xbe3d8): undefined reference to `byte_rev_table'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>