Use input instead of raw_input in gdbclient.py

Following suggestions in b/194659728, update the python script to work
under python3.

Previous failure:

Traceback (most recent call last):
  File "/android3/android/master/development/scripts/lldbclient.py", line 413, in <module>
    main()
  File "/android3/android/master/development/scripts/lldbclient.py", line 405, in main
    do_main()
  File "/android3/android/master/development/scripts/lldbclient.py", line 400, in do_main
    raw_input("Press enter to shut down lldb-server")
NameError: name 'raw_input' is not defined

Bug: none
Test: "lldbclient.py --setup-forwarding vscode-lldb -r
/data/nativetest64/inputflinger_tests/inputflinger_tests
--gtest_filter=PalmRejectorTest.GenericAxisValue_IsNotSet"

Change-Id: I21d977cbc580894d6e2eb2f2f56dec04c65b0416
1 file changed