OvmfPkg/IoMmuDxe: clean up used library classes
    
    The following library classes are not used by this module, so remove them
    from the INF file's [LibraryClasses] section:
    - DxeServicesTableLib
    - UefiLib
    
    The following library classes are used by this module, so add them to the
    INF file's [LibraryClasses] section:
    - BaseMemoryLib (e.g. via CopyMem())
    - MemoryAllocationLib (e.g. via AllocatePool())
    
    Sort the list of library classes (in both "IoMmuDxe.inf" and
    "AmdSevIoMmu.h").
    
    Remove all non-local #include directives from "IoMmuDxe.c"; both C files
    of this module include "AmdSevIoMmu.h", and "AmdSevIoMmu.h" includes all
    non-local headers already.
    
    Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Cc: Brijesh Singh <brijesh.singh@amd.com>
    Cc: Jordan Justen <jordan.l.justen@intel.com>
    Cc: Tom Lendacky <thomas.lendacky@amd.com>
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Laszlo Ersek <lersek@redhat.com>
    Tested-by: Brijesh Singh <brijesh.singh@amd.com>
    Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>