coresight: Do not default to CPU0 for missing CPU phandle

coresight: Do not default to CPU0 for missing CPU phandle

Coresight platform support assumes that a missing "cpu" phandle
defaults to CPU0. This could be problematic and unnecessarily binds
components to CPU0, where they may not be. In coresight etm and
cpu-debug drivers, abort the probe for such cases.

Signed-off-by: Sai Prakash Ranjan <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Tested-by: Mathieu Poirier <[email protected]>
Reviewed-by: Mathieu Poirier <[email protected]>
Link: https://lore.kernel.org/r/f1955ea19c714cf64ea54ec356a9aa85f3cd17b8.1562229018.git.saiprakash.ranjan@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <[email protected]>