drivers: iio: imu: Fixes asm330 slow clock sync with ap time

sync asm330 sensor timer to ap time for every irq irrespecive
of sensor running slowly or fast compared to ap timestamp.

Change-Id: I1a280203ce39d8a9c32771483ac6eabd533dcdba
Signed-off-by: Puneet Yatnal <puneet@codeaurora.org>