ASoC: fsl: imx-hdmi: remove unused structure members

cppcheck warning:

sound/soc/fsl/imx-hdmi.c:21:16: style: struct member
'cpu_priv::sysclk_freq' is never used. [unusedStructMember]
 unsigned long sysclk_freq[2];
               ^

Additional checks show the sysclk_dir member is also not used.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210219232937.6440-7-pierre-louis.bossart@linux.intel.com


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