cnss2: Add host and device time sync support

Driver will get host time ticks and device time ticks at the same
time and calculate the timestamp offset in microsecond which will
be sent back to device periodically so that device time can be
synced with host time.

Change-Id: I44d5e3f8f48115c00920099da04b996cad8b7e3f
Signed-off-by: Yue Ma <yuem@codeaurora.org>