doc: release-notes-4.0: add relevant pinctrl changes

Add relevant changes for the pinctrl area.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

doc/releases/release-notes-4.0.rst

@@ -448,6 +448,11 @@ Drivers and Sensors
 
 * Pin control
 
+  * Added support for Microchip MEC5
+  * Added SCMI-based driver for NXP i.MX
+  * Added support for i.MX93 M33 core
+  * Added support for ESP32C2
+
 * PWM
 
   * rpi_pico: The driver now configures the divide ratio adaptively.