stagefright: Fix camcorder effects on MSM8660.

 * Patch adapted from
   https://www.codeaurora.org/gitweb/quic/la/?p=platform/frameworks/base.git;a=commit;h=a686ca15dc27aeeeffa3a0039c2c546af7f6272f
 * We need to use buffers from the MM heap on the 8660 devices I am
   testing.

Change-Id: I1e31f2db521834a068e11d48e88547044b0c906f