scsi: ufs-debugfs: remove unnecessary error scenario use-cases

This change removes error scenario use-cases that have not been
implemented yet, and one error scenario (ERR_INJECT_LINK_STARTUP)
that anyway is not recoverable.

Change-Id: I78948f64ee3868333ec27e17695980b642248dcf
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>