Fix pylint issues

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/scripts/mbedtls_dev/ecp_common.py b/scripts/mbedtls_dev/ecp_common.py
index 1f2ba0a..5b10a5d 100644
--- a/scripts/mbedtls_dev/ecp_common.py
+++ b/scripts/mbedtls_dev/ecp_common.py
@@ -14,10 +14,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from . import test_case
-from . import test_data_generation
 from . import bignum_common
 
 class EcpOperationCommon(bignum_common.ModOperationCommon):
     """Target for ecp test case generation."""
-    pass
\ No newline at end of file
+    pass