Revert "arm64: topology: Handle CPU topology parsing failure case"

If cpu topology parsing failed, sched clusters were prepared with
empty cluster cpus and leads to erroneous results. Now sched cluster
preparation handles empty cluster cpus. so the commit 'cc620a7f
("arm64: topology: Handle CPU topology parsing failure case")' is
no more needed, remove it.

Change-Id: I54ad114027bee517442abde3c18ef2b80f938523
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>