[nrf fromtree] doc: releases: 4.4: Add NVMEM entry for flash device support

Add an entry with Kconfig options for NVMEM on flash devices.

Signed-off-by: Pieter De Gendt <[email protected]>
(cherry picked from commit 8439d0d)

Author: pdgendt

doc/releases/release-notes-4.4.rst

@@ -102,6 +102,13 @@ New APIs and options
   * :dtcompatible:`jedec,mspi-nor` now allows MSPI configuration of read, write and
     control commands separately via devicetree.
 
+* NVMEM
+
+  * Flash device support
+
+    * :kconfig:option:`CONFIG_NVMEM_FLASH`
+    * :kconfig:option:`CONFIG_NVMEM_FLASH_WRITE`
+
 * Settings
 
    * :kconfig:option:`CONFIG_SETTINGS_SAVE_SINGLE_SUBTREE_WITHOUT_MODIFICATION`