wlan: Changing TCP network parameters to improve TCP throughputs.

In order to improve TCP Downlink and Uplink throughputs,
we are making some changes in default tcp network parameters.
This will help to boost up the overall throughput of the entire
eco system.

CRs-Fixed: 533059
Change-Id: I9568dc60d0c9314c8956261c7e77d99c5152625c
Acked-by: Sharat Masetty <smasetty@qti.qualcomm.com>