EDK: Change Awakable::Awake()'s context, etc., to be a uint64_t.

mojo/edk/system/awakable.h

Index: mojo/edk/system/awakable.h
diff --git a/mojo/edk/system/awakable.h b/mojo/edk/system/awakable.h
index 5a94274b5e5c77cfc0bff38eee9d30192f6fb01b..4194fe09c61a91fbff1d0f303f062f0abd14549e 100644
--- a/mojo/edk/system/awakable.h
+++ b/mojo/edk/system/awakable.h
@@ -22,7 +22,7 @@ class Awakable {
   //     takes "non-terminal" locks, i.e., those which are always safe to take.
   //   - It should return false if it must not be called again for the same
   //     reason (e.g., for the same call to |AwakableList::Add()|).
-  virtual bool Awake(MojoResult result, uintptr_t context) = 0;
+  virtual bool Awake(MojoResult result, uint64_t context) = 0;
 
  protected:
   Awakable() {}