nvme: Change short option -o and -v duplicated to upper case

nvme: Change short option -o and -v duplicated to upper case

The output-format and verbose options are added by NVMF_ARGS() macro.
So some commands short option duplicated with the option added.
Change the command short options duplicated to upper case -O and -v.
But only the get-log command lpo option changed to -L not upper case.
Sicne already upper case -O option also is used for the ot option.
  Note: Documentation and completions will be updated separately.

Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>