ANDROID: x86/pkvm: Use hypercall to access the pci mmcfg

Overwrite the pci mmcfg accessing callbacks in the MMIO pv ops to use
hypercall to access the pci mmcfg rather than "mov" instruction to avoid
decoding instruction in the pkvm hypervisor.

Bug: 391539939
Bug: 353950489
BUG: 399581144
Test: Microdroid works as a protected VM
Upstream-Task: 402758258

Change-Id: I5c5bc5585126629b9113901cc12474bcad14904b
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Grzegorz Jaszczyk <jaszczyk@google.com>