ldrp-v2: schedinfo: Fix online cpus mask check

From 4.19 onwards, cpu topology contains only online cpus.
So use possible sibling cpu mask to get cluster cpus.
And,
 - for better readability, print cpu numbers instead of bitmask.
 - Verify root and sched domains for online cpus

Change-Id: Ifebf82376a38a12717ebef5b8ef22458a6cace4d
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>