OvmfPkg: AcpiTimerLib: Switch additional stages to PCD-based Dxe instance
    
    Link DXE_SMM_DRIVER, UEFI_DRIVER, UEFI_APPLICATION, and SMM_CORE against
    a valid, non-asserting version of PcdLib, then switch them over to using
    the "Dxe" instance of AcpiTimerLib (instead of the "Base" version).
    
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
    Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
    
    git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16378 6f19259b-4bc3-4df7-8a09-765794883524