init.rc: Adding setprop entries for tcp delayed ack for Wifi & LTE

TCP delayed ack settings are expected to be modified when the
Wifi or LTE connection is established and the configurations
will be reverted back when the Wifi connection is terminated.
The change also modifies the /sys/kernel/ipv4/tcp_delack_seg
and /sys/kernel/ipv4/tcp_use_useconfig file owner to "system"

Requires: https://www.codeaurora.org/cgit/quic/la/kernel/msm/commit/?h=kk_2.7-stable&id=73989a4b345bba0efca96cc86b0258e83884ff63

Change-Id: I008e36931752d6db29454c5ce41e3cfe19b15ecb

prebuilt/common/etc/init.local.rc

@@ -101,6 +101,16 @@ on boot
     chown system system /dev/cpuctl/apps/cpu.notify_on_migrate
     chmod 0644 /dev/cpuctl/apps/cpu.notify_on_migrate
 
+    # Define TCP delayed ack settings for WiFi & LTE
+    chown system system /sys/kernel/ipv4/tcp_delack_seg
+    chown system system /sys/kernel/ipv4/tcp_use_userconfig
+    setprop net.tcp.delack.default     1
+    setprop net.tcp.delack.wifi        20
+    setprop net.tcp.delack.lte         8
+    setprop net.tcp.usercfg.default    0
+    setprop net.tcp.usercfg.wifi       1
+    setprop net.tcp.usercfg.lte        1
+
 # adb over network
 on property:service.adb.tcp.port=5555
     stop adbd