hwcomposer: Fix a deadlock with debug enabled.

If debug property for MDP composition is enabled,
we call dump function from composition thread.
Make sure we are not holding the MDP composition
lock before calling dump function as this also tries
to acquire the same lock and causes a dead lock.

Change-Id: I05e5fd58be096f1ab683d796cc1beb4972c2168f
1 file changed