doc: boards: amlogic: update for Odroid HC4

Add documentation bits for the Odroid-HC4.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

doc/board/amlogic/index.rst

@@ -18,7 +18,7 @@ This matrix concerns the actual source code version.
 | Boards                       	| Odroid-C2 | P212            | Khadas VIM2  | S400       | U200       | Odroid-N2   | SEI610       |
 |        			| Nanopi-K2 | Khadas-VIM      | Libretech-PC |	          | SEI510     | Khadas-VIM3 | Khadas-VIM3L |
 |        			| P200	    | LibreTech-CC v1 |	WeTek Core2  |	          |            | GT-King/Pro | Odroid-C4    |
-|        			| P201	    | LibreTech-AC v2 |	             |	          |            |             |              |
+|        			| P201	    | LibreTech-AC v2 |	             |	          |            |             | Odroid-HC4   |
 +-------------------------------+-----------+-----------------+--------------+------------+------------+-------------+--------------+
 | UART                       	| **Yes**   | **Yes**         | **Yes**      | **Yes**    | **Yes**    | **Yes**     | **Yes**      |
 +-------------------------------+-----------+-----------------+--------------+------------+------------+-------------+--------------+

doc/board/amlogic/odroid-c4.rst

@@ -17,6 +17,9 @@ Co. Ltd with the following specifications:
  - UART serial
  - Infrared receiver
 
+The ODROID-HC4 is a variant with a PCIe-SATA controller, the same commands
+applies for HC4.
+
 Schematics are available on the manufacturer website.
 
 U-Boot compilation