Fix VolumeHelperTest on automotive

On automotive platforms the hardening enforcer is blocking a lot of
set/adjust stream volume calls. Skipping those tests.

Also added some minor improvements regarding the assertEqual checking
order.

Flag: TEST_ONLY
Test: atest VolumeHelperTest
Bug: 369155290
Change-Id: I4eebedadbbdb367123938f6c67283a986bad0518