i2c: bma250: Gyroscope Wake Option (Flick2Wake/Pick2Wake)

HTC One/bma250 implementation by @tbalden
Uses the gyroscope x/y/z values and IRQ based hook for sleep
mode detection.
i2c: bma250: flick2wake: adding a new option, sensitivity

controls how easily the interrupt is percepted, or in wake mode,
how easily it sleeps based on axis value overloads.
defconfig: gyro wake option
i2c: bma250: gyro wake: separating flick2sleep and flick2wake