Add changelog entry Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

diff --git a/ChangeLog.d/mbedtls_psa_ecp_generate_key-no_public_key.txt b/ChangeLog.d/mbedtls_psa_ecp_generate_key-no_public_key.txt
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+++ b/ChangeLog.d/mbedtls_psa_ecp_generate_key-no_public_key.txt

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+Changes
+   * Improve performance of PSA key generation with ECC keys: it no longer
+     computes the public key (which was immediately discarded). Fixes #9732.