1) Add descriptions for the enum values or struc members for the following types:

1) Add descriptions for the enum values or struc members for the following types:
  EFI_ALLOCATION_TYPE
  EFI_MEKORY_DESCRITOR
  EFI_TIMER_DEALY
  EFI_RESET_TYPE
  EFI_INTERFACE_TYPE
  EFI_OPEN_PROTOCOL_INFORMATION_ENTRY
  EFI_LOCATE_SEARCH_TYPE
  EFI_CAPSULE_BLOCK_DESCRIPTOR
  EFI_CAPSULE_HEADER

2) Rearrange some content to eliminate the need for the forward declaration of EFI_SYSTEM_TABLE
3) Update signature declarations to use EFI_SIGNATURE_64().
4) Move macro NEXT_MEMORY_DESCRITOR() from this file to the UEFI Library.  It is not part of the UEFI Specification.
5) Fix hot key related type names to match the UEFI Specification

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6908 6f19259b-4bc3-4df7-8a09-765794883524