Add boot option override and TPM enable toggle

- Adds ability to set a bootsource override to allowable target value
- Adds ability to enable or disable TPM required policy
- Replace

Add boot option override and TPM enable toggle

- Adds ability to set a bootsource override to allowable target value
- Adds ability to enable or disable TPM required policy
- Replaces power operations confirm directive with bootstrap modal

Tested: Confirmed override settings saved to redfish but unable to verify
if settings are automatically set to disabled by petitboot after a
one time boot. Passes DAP.

Resolves openbmc/phosphor-webui#82
Resolves openbmc/phosphor-webui#90

Signed-off-by: Dixsie Wolmers <dixsiew@gmail.com>
Change-Id: If0ffd6f9328939d70c7958ee11fb90bd20a1e685
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>

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