Use Doxygen style comments consistently.

We were already using them for functions; use them for struct members
and enum values as well.

Change-Id: I89c1ef9e4a4f19424186b4da5855522bac0a2c4d
diff --git a/inc/hf/mm.h b/inc/hf/mm.h
index 0f5a4a6..d5752f4 100644
--- a/inc/hf/mm.h
+++ b/inc/hf/mm.h
@@ -46,21 +46,21 @@
 #define MM_MODE_X 0x04 /* execute */
 #define MM_MODE_D 0x08 /* device */
 
-/*
+/**
  * This flag indicates that memory allocation must not use locks. This is
  * relevant in systems where interlocked operations are only available after
  * virtual memory is enabled.
  */
 #define MM_MODE_NOSYNC 0x10
 
-/*
+/**
  * This flag indicates that the mapping is intended to be used in a first
  * stage translation table, which might have different encodings for the
  * attribute bits than the second stage table.
  */
 #define MM_MODE_STAGE1 0x20
 
-/*
+/**
  * This flag indicates that no TLB invalidations should be issued for the
  * changes in the page table.
  */