Fixup: Rename mbedtls_uecc_pk -> mbedtls_pk_uecc

This is in line with the naming of the analogous function mbedtls_pk_ec
used for legacy ECC PK contexts.
diff --git a/include/mbedtls/pk.h b/include/mbedtls/pk.h
index c65f39c..a9d763a 100644
--- a/include/mbedtls/pk.h
+++ b/include/mbedtls/pk.h
@@ -173,7 +173,7 @@
 #endif /* MBEDTLS_RSA_C */
 
 #if defined(MBEDTLS_USE_TINYCRYPT)
-static inline mbedtls_uecc_keypair *mbedtls_uecc_pk( const mbedtls_pk_context pk )
+static inline mbedtls_uecc_keypair *mbedtls_pk_uecc( const mbedtls_pk_context pk )
 {
     return( (mbedtls_uecc_keypair *) (pk).pk_ctx );
 }