Drop x86-efi-Calling-__pa-with-an-ioremap-address-is-invalid (rhbz 748516)
    
    Discussed this with Matt Fleming and Matthew Garrett.  The patch was added to
    fix an oops case on 32-bit EFI machines, but we don't support 32-bit EFI and it
    is causing regressions on 64-bit EFI Macs.  Drop the patch for now.