boards: ene: adopt new zephyr:board directive and role

This updates the documentation of all the ENE Technology boards to use
the new `zephyr:board::` directive.

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

boards/ene/kb1200_evb/doc/index.rst

@@ -1,7 +1,4 @@
-.. _ene_kb1200_evb:
-
-ENE KB1200_EVB
-##############
+.. zephyr:board:: kb1200_evb
 
 Overview
 ********

doc/LICENSING.rst

@@ -59,8 +59,8 @@ ENE KB1200_EVB Board OpenOCD Configuration
 ------------------------------------------
 
 * *Licensing:* `GPLv2 License`_
-* *Impact:* This file is used by `OpenOCD`_ when programming and debugging the :ref:`ene_kb1200_evb`
-  board. It is never linked into the firmware.
+* *Impact:* This file is used by `OpenOCD`_ when programming and debugging the
+  :zephyr:board:`kb1200_evb` board. It is never linked into the firmware.
 * *Files:*
 
   * :zephyr_file:`boards/ene/kb1200_evb/support/openocd.cfg`