This commit adds secure boot support via redfish APIs.
Following methods are introduced on redfish ops:
1) get_secure_boot_mode
2) set_secure_boot_mode
3) clear_secure_boot_keys
4) reset_secure_boot_keys
Co-Authored-By: Debayan Ray <debayan.ray@gmail.com>
Partial-Bug: 1691955
Change-Id: I60384a1e8093a2e926fc4341e89b559218d10d4f