Remove obsolete comment

Removed TBD comment that is no longer relevant since
that portion of the code has been updated.

Signed-off-by: John Durkop <john.durkop@fermatsoftware.com>
diff --git a/library/psa_crypto_driver_wrappers.c b/library/psa_crypto_driver_wrappers.c
index a8dcc06..262070c 100644
--- a/library/psa_crypto_driver_wrappers.c
+++ b/library/psa_crypto_driver_wrappers.c
@@ -273,9 +273,6 @@
 
 #if defined(PSA_CRYPTO_DRIVER_TEST)
         case PSA_CRYPTO_TEST_DRIVER_LIFETIME:
-            /* TBD: opaque driver support: need to calculate size through a
-             * driver-defined size function, since the size of an opaque (wrapped)
-             * key will be different for each implementation. */
 #ifdef TEST_KEY_CONTEXT_SIZE_FUNCTION
             *expected_size = test_size_function( key_type, key_bits );
             return( PSA_SUCCESS );