Camera: Fix max video size for external camera

Similar to https://r.android.com/2148797, fix the frame duration
comparison formula to filter >=30fps resolutions.

Bug: 262577978, 237230436
Test: android.hardware.camera2.cts.RobustnessTest#testVerifyMandatoryOutputCombinationTables
Change-Id: I6aedfbbdf2b3840746f32f4b05c8c158fc3d70c3