msm8953-common: Enable GL comp backpressure

Enable backpressure for client composition to avoid jank due to
HWC queue stuffing.

Test: 1. Open Camera
      2. Swipe horizontally to go back to previous app.

Bug: 138083790
Change-Id: I3d26aa470c1660b23bd97133f39858f92638aca8

product.prop

@@ -33,6 +33,7 @@ vendor.display.enable_default_color_mode=1
 ro.sf.hwc_set_default_colormode=true
 debug.sf.enable_hwc_vds=1
 debug.sf.hw=1
+debug.sf.enable_gl_backpressure=1
 debug.sf.latch_unsignaled=1
 debug.egl.hw=1
 persist.hwc.mdpcomp.enable=true