Fix broken and flaky VTS tests

nvResetConfig takes some time to reset the modem, causing subsequent
tests to fail with a timeout since the modem is unavailabe.
Add a timeout after nvResetConfig to allow the modem to be up again
before running the next test.

Bug: 259674407
Test: atest VtsHalRadioTargetTest
Change-Id: Ic7188f9d8ccfcd90d844b45e3b370a3be3c515d6
Merged-In: Ic7188f9d8ccfcd90d844b45e3b370a3be3c515d6
(cherry picked from commit ddaea2e5)