bmc_fw_update: Support `token` in addition to `user/pass`

[glimchb]

See start #62 and #67 and #72

[glimchb]

left to fix: https://github.com/opiproject/ansible-opi-dpu/blob/main/roles/bmc_fw_update/tasks/main.yml
need to define block that uses user/pass and another block that uses token instead

[abhashsolanki18]

Hi @glimchb
I'd like to work on this issue. Could you please assign it to me?
Thanks!