ASoC: Intel: Skylake: Remove driver debugfs exit

ASoC: Intel: Skylake: Remove driver debugfs exit

For driver debugfs, debugfs_remove_recursive() is called which is not
needed as it is already done in ASoC core debugfs. And a device managed
memory need not be freed explicitly as device core frees it up. So
remove unnecessary skl_debugfs_exit().

Fixes: 5cdf6c09ca9d ASoC: ("Intel: Skylake: Add debugfs support")
Reported-by: Julia Lawall <[email protected]>
Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Guneshwor Singh <[email protected]>
Signed-off-by: Mark Brown <[email protected]>