prebuilts: Remove outdated TCP init script

These props are long deprecated and code cross reference
takes us back to KitKat days.

Change-Id: Id98f6ade71d877b64466906ddb1a1e6dd251904a

prebuilt/common/etc/init/lineage-tcp.rc

-on boot
-    # 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