doc: releasenotes: v4.2.0 release prep

Initial release notes for v4.2.0

Signed-off-by: David Leach <[email protected]>

Author: dleach02

doc/releases/release-notes-nxp-zsdk-v4.2.0.txt

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+NXP Zephyr SDK v4.2.0.0 Release Notes
+=============================
+
+The nxp-zsdk provides a NXP Zephyr Downstream for NXP SOCs.
+
+How to get the code
+===================
+
+The git tag for this release is "nxp-v4.2.0".  See the ZSDK Getting Started at
+https://github.com/nxp-zephyr/nxp-zsdk/tree/main/doc/Getting-Started.md.  The
+West init command is as follows:
+
+ $ west init -m https://github.com/nxp-zephyr/nxp-zsdk.git --mr nxp-v4.2.0
+
+Then, run:
+ $ west update
+ $ west zephyr-export
+
+Release Highlights
+==================
+
+Aligned with Zephyr Project v4.2-branch
+
+Zephyr Project sync SHA : <<INSERT SHA>>
+
+nxp-zephyr Change Log
+=====================
+Following Changes have been applied on top of the Zephyr v4.2.0 release branch:
+
+Base Enablement
+===============
+
+- RW61x: Added standby (Power Mode 3 - PM3) support
+- Enabled standby (PM3) for RW612 and set IMU as wakeup source
+- rw6xx: Added support for XTAL32K clock
+- Added support to wakeup from a pin input
+- Added support to wakeup from an external pin
+- Set IMU as wakeup source for frdm_rw612
+
+
+BLE support
+============
+
+Wi-Fi support
+=============
+
+For RW612/IW610/IW416/IW612:
+- Support both supplicant and embedded supplicant
+- Support getting Wi-Fi channel load
+- Support host frame TX in monitor mode
+- Support overriding TX power limit file
+- Support net monitor mode
+For IW610/IW416/IW612:
+- Support nxp_mfg_bridge example
+- Support crypto hardware accelerator for enterprise mode
+
+OpenThread Support
+==================
+
+TF-M / mbedTLS / Crypto
+=======================
+
+- els_pkc crypto module updated to v2.0.0
+- psa_crypto_driver performance improvements
+- mbedTLS v3.6.3 with support for HW acceleration via PSA APIs for RW61x
+- TF-M v2.2.0 enablement for RW61x
+- BL2 by default enabled for TF-M examples 
+
+EdgeLock 2GO support
+====================
+
+- Updated nxp_iot_agent module to v6.3.0