Fix bug in ndk api isCameraDeviceSharingSupported

When camera device sharing is not supported, the function
ACameraManager_isCameraDeviceSharingSupported should return
ACAMERA_OK and sharing supported as false.

Flag: com.android.internal.camera.flags.camera_multi_client
Bug: 392150062
Test: run CTS test SharedCameraTest#testCameraDeviceSharingNotSupported
Change-Id: If58d5f97f146cbc0882129c27b3f85c3a73524ab