scsi: osst: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Addresses-Coverity-ID: 114983 ("Missing break in switch")
Addresses-Coverity-ID: 114984 ("Missing break in switch")
Addresses-Coverity-ID: 114985 ("Missing break in switch")
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>