WhitleyOpenBoardPkg/BoardAcpiLib: Simplify implementation

Remove DXE version as the library isn't in use.
Simplify the SMM library.  Remove functions calling functions.

Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Signed-off-by: Isaac Oram <isaac.w.oram@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>