trace: ipc_logging: Convert to debugfs_file_get() and -put()

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

Change-Id: I83781f97cd5ee5d441a915afb1d235427c206003
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>