debugfs: convert to debugfs_file_get() and -put()

Convert all calls to the now obsolete debugfs_use_file_start() and
debugfs_use_file_finish() from the debugfs core itself to the new
debugfs_file_get() and debugfs_file_put() API.

Change-Id: I335bdb5050297b561281c51f840a81097e8ea88a
Fixes: 49d200de ("debugfs: prevent access to removed files' private data")
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 69d29f9e6a53559895e6f785f6cf72daa738f132
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>