PSA support for HMAC_DRBG: changelog entry

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/psa-crypto-hmac-drbg.txt b/ChangeLog.d/psa-crypto-hmac-drbg.txt
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+Features
+   * The PSA crypto subsystem can now use HMAC_DRBG instead of CTR_DRBG.
+     CTR_DRBG is used by default if it is available, but you can override
+     this choice by setting MBEDTLS_PSA_HMAC_DRBG_MD_TYPE at compile time.
+     Fix #3354.