camera_metadata: Add 'hal_details' field, rename 'notes' field to 'details'

- Details will contain the full documentation aimed at API users
- HAL details will contain additional notes for HAL implementors

Change-Id: I66452914382b8eca166a032bff4681d7fcef22cf
diff --git a/camera/docs/metadata_parser_xml.py b/camera/docs/metadata_parser_xml.py
index 6772282..dd53131 100755
--- a/camera/docs/metadata_parser_xml.py
+++ b/camera/docs/metadata_parser_xml.py
@@ -225,7 +225,7 @@
   def _parse_entry_optional(self, entry):
     d = {}
 
-    optional_elements = ['description', 'range', 'units', 'notes']
+    optional_elements = ['description', 'range', 'units', 'details', 'hal_details']
     for i in optional_elements:
       prop = find_child_tag(entry, i)