doc: release: 2.4: Add notes about Atmel related changes

Adds 2.4.0 release notes for Atmel SoCs, boards, and drivers.

Signed-off-by: Gerson Fernando Budke <[email protected]>

Author: nandojve

doc/releases/release-notes-2.4.rst

@@ -266,6 +266,7 @@ Boards & SoC Support
 * Added support for these SoC series:
 
   * ARM Cortex-M1/M3 DesignStart FPGA
+  * Atmel SAM4L
   * Nordic nRF52805
   * NXP i.MX RT685, i.MX8M Mini, and LPC11U6x
   * ARC QEMU support for EM and HS family
@@ -292,6 +293,7 @@ Boards & SoC Support
 
   * ARM Cortex-M1/M3 DesignStart FPGA reference designs running on the Digilent
     Arty A7 development board
+  * Atmel SAM4L-EK board
   * Laird Connectivity Pinnacle 100 Modem Development board (pinnacle_100_dvk)
   * nRF21540 DK (nrf21540dk_nrf52840)
   * nRF52805 emulation on nRF52 DK (nrf52dk_nrf52805)
@@ -415,7 +417,7 @@ Drivers and Sensors
   * Added LPC11U6X driver.
 
 * Hardware Info
-
+  * Added Atmel SAM4L driver
 
 * I2C