Extend DDS switch validation timeout

According to the analysis in b/293356801#comment17, the current timeout validation is too short.
Extending the default timeout wouldn't have any unexpected consequence because there aren't any pending items in the case of timeout occurs.

Fix: 293356801
Test: daily test b/296088621
Change-Id: If19bbaa25a02adc60af327099eab2ee0556dc5f9