VTS: Reduce the number of sensors activated in parallel

To reduce unnecessary load on the sensors subsystem, avoid activating
all declared sensors at the same time, especially when not strictly
required.

Bug: 406808352
Test: atest VtsAidlHalSensorsTargetTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:2fe99d7f54ee9faa81d46c99c8cc2e83f90ba980)
Merged-In: Ib19b1e8d5fc0d5a227ecfd6ee2519233ba6b1e51
Change-Id: Ib19b1e8d5fc0d5a227ecfd6ee2519233ba6b1e51