native: Make setting the buffers size conditional to qualcomm hardware

This is a partial ifdef of CAF commit d6eecf50919312c1dd778c5742de72bb98f98f1a.

Some devices might have proprietary bits that link against libgui/libui components
and are not expecting the ABI mismatch introduced in that commit.

Change-Id: I0670990fcb903ee750d4d2925175b9588cf35f45
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_frameworks_native into cm-11.0