Camera: Don't advertize zoom in case max digital zoom is 1

Mark immediate zoom as not supported in case the camera has
maximum digial zoom close to 1. This will avoid corner
cases wehere we can have 'NUM_ZOOM_STEPS' all equal to 1.

Bug: 33093106
Test: Complete CameraTest CTS package
runtest -x cts/tests/camera/src/android/hardware/cts/

Change-Id: I039276385de74192375f36b1504dd89cb8ae0c52