selftests/ftrace: Fix to use remount when testing mount GID option

Fix mount_options.tc to use remount option to mount the tracefs.
Since the current implementation does not umount the tracefs,
this

selftests/ftrace: Fix to use remount when testing mount GID option

Fix mount_options.tc to use remount option to mount the tracefs.
Since the current implementation does not umount the tracefs,
this test always fails because of -EBUSY error.
Using remount option will allow us to change the mount option.

Link: https://lore.kernel.org/r/173625186741.1383744.16707876180798573039.stgit@devnote2
Fixes: 8b55572e5180 ("tracing/selftests: Add tracefs mount options test")
Signed-off-by: Masami Hiramatsu (Google) <[email protected]>
Cc: [email protected]
Signed-off-by: Shuah Khan <[email protected]>

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