Add UEFI SecureBoot Setting related interfaces

Redfish added schema for SecureBoot, which contains UEFI Secure Boot
related information and represents properties for managing the UEFI
Secure Boot fu

Add UEFI SecureBoot Setting related interfaces

Redfish added schema for SecureBoot, which contains UEFI Secure Boot
related information and represents properties for managing the UEFI
Secure Boot functionality of a system. It would be useful to add
remote UEFI secure boot configuration support which provides unified
interface for remote uefi secure boot configuration in data centers,
and provide a generic implementation for the remote management of
uefi secure boot.

Redfish Schema -
https://redfish.dmtf.org/schemas/v1/SecureBoot.v1_1_2.json

BIOSConfig.SecureBoot exposes three properties:
1) Enable: An indication of whether UEFI Secure Boot is enabled.
2) Current Boot: An indication of UEFI Secure Boot state during the
current boot cycle
3) Mode: Indicates the current UEFI Secure Boot mode, as defined in
the UEFI Specification.

Change-Id: I1a345c2efcdd42be9920b509649621157b88775a
Signed-off-by: Prithvi Pai <ppai@nvidia.com>

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