Fix pylint issues

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/scripts/mbedtls_dev/ecp.py b/scripts/mbedtls_dev/ecp.py
index 713dd96..f9d6af5 100644
--- a/scripts/mbedtls_dev/ecp.py
+++ b/scripts/mbedtls_dev/ecp.py
@@ -16,7 +16,6 @@
 
 from typing import List
 
-from . import test_case
 from . import test_data_generation
 from . import ecp_common
 
@@ -36,13 +35,13 @@
 
     # Extend the default values with n < x < 2n
     input_values = ecp_common.EcpOperationCommon.input_values + [
-            "73",
-            "ebeddd7b4fefae8755bbfb9c181a73347096b3ec70d1a021",
-            ("1f4e1d074d0b50e8d8818f9a9e5df9959f902bb955fd24fd3d791175226ad8c1"
-             "fcb6d59fa41a3dcb25412009e5e356eb65b50ca67782285290420b45b32f0d63"
-             "7c9ee549a52ad8d631ba4945435c9aec77227ec59faff878b71b920a3d631929"
-             "d636c9a409d6ffdcd95e2568e128596811fb9ade15e69f6efd509381ebbf3599")
-            ] # type: List[str]
+        "73",
+        "ebeddd7b4fefae8755bbfb9c181a73347096b3ec70d1a021",
+        ("1f4e1d074d0b50e8d8818f9a9e5df9959f902bb955fd24fd3d791175226ad8c1"
+         "fcb6d59fa41a3dcb25412009e5e356eb65b50ca67782285290420b45b32f0d63"
+         "7c9ee549a52ad8d631ba4945435c9aec77227ec59faff878b71b920a3d631929"
+         "d636c9a409d6ffdcd95e2568e128596811fb9ade15e69f6efd509381ebbf3599")
+        ] # type: List[str]
 
     def result(self) -> List[str]:
         result = self.int_a % self.int_n
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