Remove obsolete comment

Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
diff --git a/library/psa_crypto_cipher.c b/library/psa_crypto_cipher.c
index 36c7e73..d8c722b 100644
--- a/library/psa_crypto_cipher.c
+++ b/library/psa_crypto_cipher.c
@@ -160,8 +160,6 @@
 
     (void)key_buffer_size;
 
-    /* Proceed with initializing an mbed TLS cipher context if no driver is
-     * available for the given algorithm & key. */
     mbedtls_cipher_init( &operation->ctx.cipher );
 
     operation->alg = alg;