Remove libnpt from system again.

http://r.android.com/914573 fixes libjdwp to look for it in the APEX.

Test: Flash and boot
Test: adb forward tcp:5555 jdwp:`adb shell pidof com.android.email` && jdb -attach localhost:5555
Test: atest CtsJdwpTestCases
Bug: 124498388
Change-Id: Idf380660a21c88969e42d6a03a6b50fd2baa4c17