OvmfPkg: link Sha384 and Sha512 support into Tcg2Pei and Tcg2Dxe

OvmfPkg: link Sha384 and Sha512 support into Tcg2Pei and Tcg2Dxe

Sha384 and Sha512 were added to HashInstanceLib recently. To make them
available in Tcg2Pei and Tcg2Dxe, we have to link both libraries.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Build-tested-by: Laszlo Ersek <lersek@redhat.com>