Remove waitpid on UnMount

Since we no longer have the Fuse Daemon, we won't ever
need to stop the daemon when unmounting.

Bug: 33808187
Test: Run "adb shell ps | grep -w Z"
          The sdcard daemon should not be listed.
Change-Id: I6bb9341785b711d81553393f7c3b56115c435236
2 files changed