depends.py: remove config options that are unset anyway

Over the lifespan of this script these options have been removed
from the "full" configuration.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/tests/scripts/depends.py b/tests/scripts/depends.py
index 232e3fc..c5d0bba 100755
--- a/tests/scripts/depends.py
+++ b/tests/scripts/depends.py
@@ -145,9 +145,6 @@
 derived."""
     # Turn off options that are not relevant to the tests and slow them down.
     run_config_py(options, ['full'])
-    run_config_py(options, ['unset', 'MBEDTLS_MEMORY_BACKTRACE'])
-    run_config_py(options, ['unset', 'MBEDTLS_MEMORY_BUFFER_ALLOC_C'])
-    run_config_py(options, ['unset', 'MBEDTLS_MEMORY_DEBUG'])
     run_config_py(options, ['unset', 'MBEDTLS_TEST_HOOKS'])
 
 def collect_config_symbols(options):