Improvements for new UEFI releases (mppark)

[gus33000]

Note: these changes require the merge of a PR for UEFI, however, the changes are designed to be backward compatible with older UEFI versions

UEFI PR: WOA-Project/Lumia950XLPkg#70

Details:

• The UEFI now reads parameters passed by bootshim via an updated preloader struct, these parameters allow the UEFI to load different acpi tables, enabling SD card boot capability for windows, and/or changing processor declarations for EL2/Hyper-V
• In addition, a new parameter has been added which tells the UEFI to either start normally, with PSCI, or start in EL1 with no PSCI, or start in EL2 with no PSCI

Please do not merge this commit without merging the UEFI one, as they depend on each other.