Debug Print Error level can be controled by an EFI variable. Update the DXE version of the library to use a HOB if the variable services are not yet availilbe. This allows the variable to be used early in the DXE phase.
approved-by: andrewfish
reviewed-by: lgao4
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12516 6f19259b-4bc3-4df7-8a09-765794883524
1) Add DebugMask.h that defines the GUID and Protocol used by the "err" EFI Shell command to get/set the global mask and get/set the module scoped masks
2) Add DxeDebugPrintErrorLevelLib that provide an implementation of the DebugPrintErrorLevbel library classes that uses the GUID and Protocol defined in DebugMask.h to "err" EFI Shell compatibility.
3) Add default mapping for the DebugPrintErrirLevelLib to the DSC file for this package.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11366 6f19259b-4bc3-4df7-8a09-765794883524