composer: add 1ms delay after SendLTMCommand

Sometimes Dpps receives the combined command by on and
state commands, add 1ms delay after SendLTMCommand()
to avoid Dpps receives the wrong message.

Bug: 161556748
Test: change LTM state more than 100 times, and do not
      observe this problem.

Change-Id: Iedcd1ecbcd2a1a70b4f702cd3cfd49a96d3e4efe
1 file changed