drivers: iio: imu: Added HW timestamp rollover management

In case of continuous long run (over ~30 hours) manage HW
timestamp rollover.

Git-commit: d2962be976ed01f0176dc1e920172547f6aadbf0
Git-repo: https://github.com/STMicroelectronics/STMems_ASM330LHH_IIO_HAL_Driver.git


Signed-off-by: Mario Tesi <mario.tesi@st.com>
(cherry picked from commit d2962be976ed01f0176dc1e920172547f6aadbf0).

Change-Id: Ia529ddaef67f12c31aea52a63c7702ad3a157bc0
Signed-off-by: Puneet Yatnal <puneet@codeaurora.org>