Revert "msm8953-common: add system property to set AudioFlinger client heap size"

 * This is wrong. The original commit message is for a 1-GB
   RAM device. We have at least 16MB heap size by default.

This reverts commit 7341640d6051dd293029c7424c55a74d64653316.

Change-Id: I7eea6af39cdad7f1e20c78e0d62ce9ef8b346e78

prop.mk

@@ -15,7 +15,6 @@ persist.vendor.audio.fluence.voicerec=true \
 ro.config.media_vol_steps=25 \
 ro.config.vc_call_vol_steps=7 \
 persist.vendor.btstack.enable.splita2dp=false \
-ro.af.client_heap_size_kbyte=7168 \
 ro.vendor.audio.sdk.fluencetype=fluence \
 ro.vendor.audio.sdk.ssr=false \
 vendor.audio.flac.sw.decoder.24bit=true \