msm: ipa4: gsb: correct the aggregation time limit

Update the aggregation time limit from 1 to 1000 since the unit
is us and the granularity at least 100.

Change-Id: Ic1e6d2c5f4c9dae90f3f854b11cec7863d91c671
Signed-off-by: Bojun Pan <bojunp@codeaurora.org>