doc: release-notes-4.0: add MIPI-DBI release notes

Add release notes for MIPI-DBI capturing significant changes since 3.7

Signed-off-by: Daniel DeGrasse <[email protected]>

Author: danieldegrasse

doc/releases/release-notes-4.0.rst

@@ -550,6 +550,11 @@ Drivers and Sensors
 
 * MIPI-DBI
 
+  * Added bitbang MIPI-DBI driver, supporting 8080 and 6800 mode
+    (:dtcompatible:`zephyr,mipi-dbi-bitbang`).
+  * Added support for STM32 FMC memory controller (:dtcompatible:`st,stm32-fmc-mipi-dbi`).
+  * Added support for 8080 mode to NXP LCDIC controller.
+
 * MSPI
 
 * Pin control