OvmfPkg: Update DSC/FDF files to consume CSM components in OvmfPkg

OvmfPkg: Update DSC/FDF files to consume CSM components in OvmfPkg

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1811

This commit updates the OVMF DSC/FDF files to consume the copied CSM
components within OvmfPkg.

Cc: Ray Ni <ray.ni@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Hao A Wu <hao.a.wu@intel.com>
Reviewed-by: David Woodhouse <dwmw2@infradead.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>