net: wireless: bcmdhd: reduced the wakelock time of RX packet

	Reduce time : 1secs -> 500ms
	Problem : [Issue 11512235] 34% battery eaten overnight
		  [Issue 11374623] OS + Wifi used 41% of battery,
		  wlan_rx_wake
Signed-off-by: Ecco Park <eccopark@broadcom.com>

Conflicts:
	drivers/net/wireless/bcmdhd/dhd.h