PCI: Introduce pci_resource_n()

[ Upstream commit 144d204d ]

Introduce pci_resource_n() and replace open-coded implementations of it
in pci.h.

Link: https://lore.kernel.org/r/20230330162434.35055-3-andriy.shevchenko@linux.intel.com


Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Stable-dep-of: 360c400d ("p2sb: Do not scan and remove the P2SB device when it is unhidden")
Signed-off-by: Sasha Levin <sashal@kernel.org>