Change function name *pwn* -> *pwm* in Vibrator

Change-Id: I66196dea5db2c830dfb7d6ff4606beffc8997151
Signed-off-by: Rashed Abdel-Tawab <rashedabdeltawab@gmail.com>
Fix ktime_t error in Vibrator

Fix the ktime_t has no member named 'tv' build error in the
Vibrator driver

Change-Id: I4726d7ec1b640b7a06da4e7c513ec37352f2cb7b
Signed-off-by: Rashed Abdel-Tawab <rashedabdeltawab@gmail.com>