VTSHalAudio: Increase test timeout for V6 and V7

V6 and V7 use actual device audio configuration
when testing I/O streams functionality. On low-end
TV devices this can cause the test to run for
significant time due to lower CPU speed and the
amount of multichannel configurations.

From testing on real devices, the timeout value
of 5 minutes seems to be adequate.

Bug: 211945822
Test: atest VtsHalAudioV6_0TargetTest
Change-Id: Ie233e014f9f3650f58319c4d5f5a836cfdea87ba
(cherry picked from commit 57633e5a)