add changelog

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/ChangeLog.d/8030.txt b/ChangeLog.d/8030.txt
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+Changes
+   * Extended PSA Crypto configurations options for FFDH by making it possible
+     to select only some of the parameters / groups, with the macros
+     PSA_WANT_DH_RFC7919_XXXX. You now need to defined the corresponding macro
+     for each size you want to support. Also, if you have an FFDH accelerator,
+     you'll need to define the appropriate MBEDTLS_PSA_ACCEL macros to signal
+     support for these domain parameters.