to enable early print output by pci uart, which has mmio address
above 4G, add the early pagetable map for the MMIO range.
we make an assumption that only map it with 2MB page, since platform
with 39bit memory width have no 1G huge page feature and we cannot
get the capacity at runtime, since it is a very early code stage.
v2->v1:
1. add hva2hpa_early
2. add process when *pdpte is not present
Signed-off-by: hangliu1 <hang1.liu@linux.intel.com>
Reviewed-by: fei1.li <fei1.li@intel.com>
Tracked-On: #6690
bb2118d98b