drivers: soc: system_health_monitor: Rate-limit the system health check

Add support to rate-limit the health check requests as required and
configured by subsystems.

CRs-Fixed: 723919
Change-Id: I95a7d60ed60a2bd9e864c5d8f94aa9000edad326
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>