wlan: Set BATFET to NPM when wifi is on

PMIC has a voltage drop problem in suspend when BATFET is LPM(low power mode).
To avoid this issue, set BATFET to NPM(Normal power mode) only when wifi is on.
The current will be increased by about 0.2mA when wifi is on.

Change-Id: I3e9776d2ecf699faca9a415957f1883dff0bc2c4
Signed-off-by: Zheng Guolin <zhengguolin@huawei.com>