IntelFsp2Pkg/FspSecCore: Use UefiCpuLib.

IntelFsp2Pkg/FspSecCore: Use UefiCpuLib.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2825

UefiCpuLib has API InitializeFloatingPointUnits.
Remove internal copy of InitializeFloatingPointUnits
in FspSecCoreM, use UefiCpuLib API.

This change also avoid later potential conflict when
use UefiCpuLib for FspSecCoreM module.

Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>