Clean up the following includecheck warning:

./sound/soc/sof/intel/pci-tng.c: shim.h is included more than once.

No functional change.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Changcheng Deng <deng.changcheng@zte.com.cn>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210824030015.57267-1-deng.changcheng@zte.com.cnSigned-off-by: Mark Brown <broonie@kernel.org>