arm: ioremap: Remove unused ARM-specific function pci_ioremap_io()

This function is not used by any driver anymore. So completely remove it.

Link: https://lore.kernel.org/r/20211124154116.916-6-pali@kernel.org


Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>