PCI: pciehp: Remove unused EMI() and HP_SUPR_RM() macros

EMI() and HP_SUPR_RM() are unused, so remove them.

Link: https://lore.kernel.org/r/1587439673-39652-1-git-send-email-ani@anisinha.ca


Signed-off-by: Ani Sinha <ani@anisinha.ca>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>