Require changeable volume for VolumeLevelChange CTS-V

The Volume Level Change CTS-V requrie that the volume
can be changed in the device, so the test should be
skipped if "config_useFixedVolume" is set to true.

Bug: 272714705
Test: CTS-verifer Test: "Volume Level Changes"
(cherry picked from https://android-review.googlesource.com/q/commit:f502866faf1a7a495c1605c56e4fa5018054c2f9)
Merged-In: Ic75a942d80cc462d1a1e765a7cf0fa6991f18b2d
Change-Id: Ic75a942d80cc462d1a1e765a7cf0fa6991f18b2d
2 files changed