ASoC: ti: j721e-evm: Fix compiler warning when CONFIG_OF=n

Remove the use of of_match_ptr() macro for of_match_table to fix compiler
warning when CONFIG_OF=n:

sound/soc/ti/j721e-evm.c:528:34: warning: unused variable 'j721e_audio_of_match' [-Wunused-const-variable]

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20200928074330.13029-1-peter.ujfalusi@ti.com


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