Platform/Loongson: Add PciCpuIoDxe driver.

Add PCI CpuIo protocol.there is no fix translation
offset between I/O port accesses and MMIO accesses.
Add PciCpuIo2Dxe driver to implement EFI_CPU_IO2_PROTOCOL
to add the translation for IO access.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4054



Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Bibo Mao <maobibo@loongson.cn>
Cc: Chao Li <lichao@loongson.cn>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: xianglai li <lixianglai@loongson.cn>
Reviewed-by: Chao Li <lichao@loongson.cn>