Comment out not yet defined iephys and add ephys to datatypes where it was missing

Author: TheChymera

src/schema/objects/datatypes.yaml

@@ -20,6 +20,10 @@ eeg:
   value: eeg
   display_name: Electroencephalography
   description: Electroencephalography
+ephys:
+  value: ephys
+  display_name: Electrophysiology
+  description: Data acquired using microelectrodes.
 fmap:
   value: fmap
   display_name: Field maps

src/schema/rules/files/raw/channels.yaml

@@ -71,7 +71,7 @@ coordsystem__ephys:
   $ref: rules.files.raw.channels.coordsystem
   datatypes:
     - ephys
-    - iephys
+      # TODO - iephys
   entities:
     $ref: rules.files.raw.channels.coordsystem.entities
     sample: optional