Control: Add Flags interface and CMOSClear property for boot option

Summary:
- Add "Flags" interface and "CMOSClear" property
to store the CMOS clear option.

Motivate:
-Add a interface and property

Control: Add Flags interface and CMOSClear property for boot option

Summary:
- Add "Flags" interface and "CMOSClear" property
to store the CMOS clear option.

Motivate:
-Add a interface and property to store flags
related to boot options.

Test Plan:
- Build code : pass
- Tested on YV4 system - Pass

Change-Id: I5fffaf771796b084c82e75e96292ed3426421477
Signed-off-by: Zoey YJ Chung <zoey.yj.chung.wiwynn@gmail.com>

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