Add ChangeLog entry

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/ChangeLog.d/remove-crypto-alt-interface.txt b/ChangeLog.d/remove-crypto-alt-interface.txt
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+Removals
+   * Drop support for crypto alt interface. Removes MBEDTLS_XXX_ALT options
+     at the module and function level for crypto mechanisms only. The remaining
+     alt interfaces for platform, threading and timing are unchanged.
+     Fixes #8149.
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