This turns on various PCI related options which are enabled
in the Linux kernel arch/arm64/configs/defconfig but not
yet in the OpenWrt config.
Signed-off-by: Mathew McBride <matt@traverse.com.au>
(23.05/5.15 version of commit 15d3536c9deb2927c9a39350c6fa2e59f859df2a)