soc: qcom: socinfo: Add support for new fields in revision 19

Add support for below fields coming in socinfo structure under v19:
* num_func_clusters: number of clusters with at least one functional core
* boot_cluster: cluster selected as boot cluster
* boot_core: core selected as boot core
While at it, rename some variables to align them with their
functionalities.

Signed-off-by: Naman Jain <quic_namajain@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230606134626.18790-3-quic_namajain@quicinc.com