VTSHalAudio: Increase test timeout for V6 to 10 minutes

TV devices can list a lot of configurations and have low
performing CPUs which causes the test to run for a significant
amount of time. From b/229824670 it seems that 10 minutes
should be enough.

Bug: 229824670
Test: atest VtsHalAudioV6_0TargetTest
Change-Id: Id7fa8eaa98bf2437fd1f676b9e5a7290df260fbd
(cherry picked from commit 0b9b03eb)