hcd/ehci: hcd_edpt_open() return false if ep is already opened. implement hcd_edpt_close()

test/hil/hil_test.py

@@ -340,8 +340,8 @@ def test_host_device_info(board):
     ser.close()
     if len(data) == 0:
         assert False, 'No data from device'
-
     lines = data.decode('utf-8', errors='ignore').splitlines()
+
     enum_dev_sn = []
     for l in lines:
         vid_pid_sn = re.search(r'ID ([0-9a-fA-F]+):([0-9a-fA-F]+) SN (\w+)', l)
@@ -353,7 +353,6 @@ def test_host_device_info(board):
         failed_msg = f'Expected {declared_devs}, Enumerated {enum_dev_sn}'
         print('\n'.join(lines))
         assert False, failed_msg
-
     return 0