A number of people are reporting seeing the "setup_efi_pci() failed!"
error message in what used to be a quiet boot,

  https://bugzilla.kernel.org/show_bug.cgi?id=81891

The message isn't all that helpful because setup_efi_pci() can return a
non-success error code for a variety of reasons, not all of them fatal.

Let's drop the return code from setup_efi_pci*() altogether, since
there's no way to process it in any meaningful way outside of the inner
__setup_efi_pci*() functions.
Reported-by: NDarren Hart <dvhart@linux.intel.com>
Reported-by: NJosh Boyer <jwboyer@fedoraproject.org>
Cc: Ulf Winkelvos <ulf@winkelvos.de>
Cc: Andre Müller <andre.muller@web.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NMatt Fleming <matt.fleming@intel.com>