Remove obsolete options from config.py

These options haven't existed for a long time.
diff --git a/scripts/config.py b/scripts/config.py
index 4f5edf8..c19222a 100755
--- a/scripts/config.py
+++ b/scripts/config.py
@@ -168,9 +168,6 @@
             'MBEDTLS_DEPRECATED_REMOVED',
             'MBEDTLS_HAVE_SSE2',
             'MBEDTLS_PLATFORM_NO_STD_FUNCTIONS',
-            'MBEDTLS_ECP_DP_M221_ENABLED',
-            'MBEDTLS_ECP_DP_M383_ENABLED',
-            'MBEDTLS_ECP_DP_M511_ENABLED',
             'MBEDTLS_MEMORY_DEBUG',
             'MBEDTLS_MEMORY_BACKTRACE',
             'MBEDTLS_MEMORY_BUFFER_ALLOC_C',