Defined max timeout for SyncManager CTS tests.

On slower devices, some of these tests could take a longer time, so
increase the timeout to 10 min from the default 5 min.

Fixes: 178869420
Test: atest CtsSyncManagerTest
Change-Id: Ic7255ca8549b27e81fa45b36348b4601289aa604
(cherry picked from commit 39c1a169200f3ed064f437d126998b7edfa23fe2)