MediaFrameworkTest: Configure video snapshot framerate

The video snapshot request framerate needs to match the video
recording fps. If the values are not equal, the camera device
could potentially delay the request due to internal
re-configuration. This can cause unwanted stream glitches
which can have impact on the test result.

Bug: 72456325
Test: adb shell am instrument -w -r   -e waitIntervalMs 1000 -e
timeout_msec 7200000 -e iterations 5 -e class
com.android.mediaframeworktest.stress.Camera2RecordingTest#testVideoSnapshot
com.android.mediaframeworktest/com.android.mediaframeworktest.Camera2InstrumentationTestRunner
Change-Id: Ieb232938f1c750c9768eee72e356fa2c4f8932be