Add Changelog entry for PSA DH/ECC Macros rename

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/ChangeLog.d/psa_ecc_dh_macros.txt b/ChangeLog.d/psa_ecc_dh_macros.txt
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index 0000000..033f3d8
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+++ b/ChangeLog.d/psa_ecc_dh_macros.txt
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+API changes
+   * In the PSA API, rename the types of elliptic curve and Diffie-Hellman group families to
+     psa_ecc_family_t and psa_dh_family_t, in line with the PSA Crypto API specification version 1.0.0.
+     Rename associated macros as well:
+     PSA_ECC_CURVE_xxx renamed to PSA_ECC_FAMILY_xxx
+     PSA_DH_GROUP_xxx renamed to PSA_DH_FAMILY_xxx
+     PSA_KEY_TYPE_GET_CURVE renamed to to PSA_KEY_TYPE_ECC_GET_FAMILY
+     PSA_KEY_TYPE_GET_GROUP renamed to PSA_KEY_TYPE_DH_GET_FAMILY
+