Add the sysfs entry for dumpStats and clearStats.
Previously these commands would be queried via iwpriv
enable / disable --> iwpriv wlan0 dump_dp_trace [1/3]
show --> iwpriv wlan0 dump_dp_trace 0
clear --> iwpriv wlan0 dump_dp_trace 2
it is now changed to support via sysfs:
enable / disable --> echo [1/0] > /sys/kernel/wifi/dump_dp_trace
show --> echo 2 [count] > /sys/kernel/wifi/dump_dp_trace
cat /sys/kernel/wifi/dump_dp_trace
clear --> echo 1 > /sys/kernel/wifi/clear_dp_trace
Change-Id: I2e7caec268776a79d7166020c64af93fee2f8aec
CRs-Fixed: 2691705
e95713a94e