boards: rename board image file and make them match board name

For autogeneration on board pages and indexes, consistency in naming is
required, few board names did not match the images of the boards.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

boards/arm/adafruit_feather_stm32f405/doc/index.rst

@@ -12,7 +12,7 @@ devices labeled as Feathers or FeatherWings. The board is equipped
 with a lithium ion battery charger, native USB C connector, 2MB of
 external flash memory, and SD card socket.
 
-.. image:: img/f405feather.jpg
+.. image:: img/adafruit_feather_stm32f405.jpg
      :width: 640px
      :align: center
      :alt: Adafruit Feather STM32F405 Express

boards/arm/black_f407ve/doc/index.rst

@@ -27,7 +27,7 @@ Here are some highlights of the BLACK_F407VE board:
 - Four push-buttons: RESET, K0, K1 and WK_UP
 - Mini-AB connector
 
-.. image:: img/stm32f4ve.jpg
+.. image:: img/black_f407ve.jpg
      :width: 500px
      :align: center
      :height: 500px

boards/arm/black_f407zg_pro/doc/index.rst

@@ -27,7 +27,7 @@ Here are some highlights of the BLACK_F407ZG_PRO board:
 - Four push-buttons: RESET, K0, K1 and WK_UP
 - Mini-AB connector
 
-.. image:: img/stm32f407zg_pro.jpg
+.. image:: img/black_f407zg_pro.jpg
      :width: 500px
      :align: center
      :height: 500px

boards/arm/frdm_k22f/doc/index.rst

@@ -19,7 +19,7 @@ MCUs.
   running an open source bootloader, offers options for serial communication,
   flash programming, and run-control debugging
 
-.. image:: frdm_k22f.jpg
+.. image:: ./frdm_k22f.jpg
    :width: 720px
    :align: center
    :alt: FRDM-K22F

boards/arm/nucleo_l452re/doc/index.rst

@@ -21,7 +21,7 @@ some highlights of the Nucleo L452RE board:
 - Three LEDs: USB communication (LD1), user LED (LD2), power LED (LD3)
 - One push-button: RESET
 
-.. image:: img/nucleo-l452re.jpg
+.. image:: img/nucleo_l452re.jpg
   :width: 250px
   :align: center
   :height: 188px

boards/arm/pico_pi_m4/doc/index.rst

@@ -12,7 +12,7 @@ Zephyr was ported to run on the M4 core. In a later release, it will also
 communicate with the A7 core (running Linux) via RPmsg.
 
 
-.. image:: pico_pi_m4.png
+.. image:: ./pico_pi_m4.png
    :width: 470px
    :align: center
    :alt: Pico-Pi i.MX7D

boards/arm/sam_v71_xult/doc/index.rst

@@ -10,7 +10,7 @@ The SAM V71 Xplained Ultra evaluation kit is a development platform to
 evaluate the Atmel SAM V71 series microcontrollers. The current version
 allows to use both IC variations ATSAMV71Q21A(B).
 
-.. image:: img/atsamv71-xult.jpg
+.. image:: img/sam_v71_xult.jpg
      :width: 500px
      :align: center
      :alt: SAM V71 Xplained Ultra

boards/arm/stm32g0316_disco/doc/index.rst

@@ -11,7 +11,7 @@ This discovery kit offers an SO8 to DIL8 module designed with the STM32G031J6 mi
 and allows the user to develop applications. It includes an on-board ST-LINK/V2-1 to debug
 and program the embedded STM32 microcontroller.
 
-.. image:: img/stm32g0316-disco.jpg
+.. image:: img/stm32g0316_disco.jpg
    :width: 670px
    :align: center
    :alt: STM32G0316-DISCO