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

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

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

boards/segger/ip_k66f/doc/index.rst

@@ -1,7 +1,4 @@
-.. _ip_k66f:
-
-SEGGER IP Switch Board
-######################
+.. zephyr:board:: ip_k66f
 
 Overview
 ********
@@ -13,10 +10,6 @@ Ethernet switch with Gigabit RGMII/MII/RMII interface.
 - KSZ8794CNX enables evaluation for switch functions
 - On-board debug probe J-Link-OB for programming
 
-.. image:: ip_k66f.jpg
-   :align: center
-   :alt: IP-K66F
-
 Hardware
 ********
 

boards/segger/trb_stm32f407/doc/index.rst

@@ -1,7 +1,4 @@
-.. _segger_trb_stm32f407:
-
-Cortex-M Trace Reference Board V1.2
-###################################
+.. zephyr:board:: segger_trb_stm32f407
 
 Overview
 ********
@@ -12,12 +9,6 @@ ARM Cortex-M4 CPU, to test hardware tracing with the SEGGER Trace-Pro
 debuggers. It is not meant for general prototype development because
 it is extremely limited when it comes to IO, and only has 3 LEDs.
 
-.. figure:: img/segger_trb_stm32f407.jpg
-     :align: center
-     :alt: SEGGER-TRB-STM32F407
-
-     SEGGER-TRB-STM32F407
-
 Hardware
 ********
 

samples/net/dsa/README.rst

@@ -20,7 +20,7 @@ Requirements
 Building and Running
 ********************
 
-Host machine with :ref:`ip_k66f` board from Segger.
+Host machine with :zephyr:board:`ip_k66f` board from Segger.
 
 Follow these steps to build the DSA sample application: