doc: release-notes-4.0: reset notes (none)

There were no reset driver changes in this cycle, so delete the section
in the release notes.

Signed-off-by: Declan Snyder <[email protected]>

Author: Declan Snyder

doc/releases/release-notes-4.0.rst

@@ -497,8 +497,6 @@ Drivers and Sensors
   * Upgraded CP9314 driver to B1 silicon revision
   * Added basic driver for MPS MPM54304
 
-* Reset
-
 * RTC
 
   * STM32: HSE can now be used as domain clock.