i2c: bma250: gyro wake: set last sleep time, when m7-display calls gyroscope_enable(0)

when screen is going sleeping, this way,
Flick2Wake won't happen after a power button
or touchscreen sleep event either.
i2c: bma250: gyro wake: fixing being disabled by apps when f2s

We should keep the sensor on, even when apps try to disable it
like camera exiting when Auto Orientation is off in framework.