pwm: pwm-qpnp: Fix the order of configuring PWM value

The hardware expects the PWM MSB value to be written
before LSB to avoid glitches in the output. Fix this.

Change-Id: I048bdbd0c096a6d03501bdd5b1d2d4bb50d45dd7
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>