hal_nxp: mcux: README: Add notice about SAI and CAAM driver versions

During the hal_nxp 25.09.00 update, the SAI driver was
upgraded to the latest SDK version, which introduced
issues on MCXN947 in Zephyr I2S-related test cases.
To avoid regressions, add a notice in the README advising
against updating the SAI driver as part of hal_nxp updates.

In the same update, the CAAM driver was intentionally
kept at an older version because the latest SDK driver
introduced issues on RT1160/RT1170 in Zephyr networking
test cases. Add a notice in the README advising against
updating the CAAM driver in future hal_nxp updates.

Signed-off-by: Zhaoxiang Jin <Zhaoxiang.Jin_1@nxp.com>

Author: ZhaoxiangJin

mcux/README

@@ -243,3 +243,10 @@ Patch List:
   - mcux-sdk-ng: drivers: xspi: cache64: Fix cache management issue.
    - PR: https://github.com/zephyrproject-rtos/hal_nxp/pull/597
    - This patch is in hal_nxp but is not in mcux-sdk-ng 25.09.00.
+
+Note:
+   - The SAI driver should not be updated during hal_nxp updates, since the latest SAI driver will cause runtime issues
+     on MCXN947 for Zephyr I2S-related test cases.
+     in Zephyr.
+   - The CAAM driver should not be updated during hal_nxp updates, since the latest CAAM driver will cause runtime issues
+     on RT1160/RT1170 for Zephyr NET-related test cases.