Add some definitions for efi event in Uefi/UefiSpec.h to follow spec.

Changed old event definitions reference to these new event definitions.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2729 6f19259b-4bc3-4df7-8a09-765794883524

EdkModulePkg/Universal/Network/Snp32_64/Dxe/callback.c

@@ -112,7 +112,7 @@ Returns:
   // created at a lower level (TPL_CALLBACK) it gives an assert!
   //
   if (mInitializeLock) {
-    EfiInitializeLock (&mLock, EFI_TPL_NOTIFY);
+    EfiInitializeLock (&mLock, TPL_NOTIFY);
     mInitializeLock = FALSE;
   }