Allow Context Hub VTS tests for devices with no CHRE

Currently, endpoint-related VTS tests cannot run if the device does not support CHRE (i.e. no ContextHubInfo is found through the HAL). This CL modifies the VTS test such that endpoint-related tests are ran independently of the CHRE precondition.

Bug: 386382687
Test: VtsAidlHalContextHubTargetTest pass on both real-device and cuttlefish

Change-Id: I1ef2aeccfadf877cbd6fd95d96872cd2ecd9ff4a