Fully working x86 paging support!

Fully working x86 paging support!
[BOOTLIB]: Fix a critical bug in BlpArchSwitchContext which was not switching to Firmware mode once paging was enabled.
[BOOTLIB]: Fix a critical bug in OslMain which was incorrectly setting BL_LIBRARY_INITIALIZATION_COMPLETED instead of BL_LIBRARY_FLAG_REINITIALIZE_ALL and causing all sorts of failure paths.
[BOOTLIB]: MmDefInitializeTranslation now turns on paging.
[BOOTLIB]: Implement TrpGenerateMappingTracker and BlpArchEnableTranslation
[BOOTLIB]: BlMmMapPhysicalAddressEx now works with paging enabled, and correctly finds mapped memory to use from the virtual MDLs.
[BOOTLIB]: MmPapAllocateRegionFromMdl now handles virtual allocations from MmMdlMappedUnallocated.
[BOOTLIB]: MmPapAllocatePagesInRange now handles BlMemoryKernelRange (KSEG0) allocations.
[BOOTLIB]: MmMdFindSatisfyingRegion now handles virtual descriptors as well, and handles alignment better.

svn path=/trunk/; revision=74519