wifi: Added 2 seconds wait time in RTT tests

Added 2 seconds delay in RTT tests. This helps drivers finish the
current test and process the next test.

Bug: 175605811
Test: VTS test - VtsHalWifiRttV1_4TargetTest
Change-Id: I3bb719b5b75ba960913bd405b2c8a41047689682
1 file changed