add the meson option for monitor collection freq

Add the meson option for health monitor collection frequency with a
default value of 1s.

Change-Id: I47a87c5b85eebc676239d1d3dcf90037f0bc56b1
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>
diff --git a/health_monitor.cpp b/health_monitor.cpp
index 772bdf9..de8b723 100644
--- a/health_monitor.cpp
+++ b/health_monitor.cpp
@@ -1,3 +1,5 @@
+#include "config.h"
+
 #include "health_monitor.hpp"
 
 #include <phosphor-logging/lg2.hpp>
@@ -44,7 +46,8 @@
             debug("Reading Health Metric Collection for {TYPE}", "TYPE", type);
             collection->read();
         }
-        co_await sdbusplus::async::sleep_for(ctx, std::chrono::seconds(1));
+        co_await sdbusplus::async::sleep_for(
+            ctx, std::chrono::seconds(MONITOR_COLLECTION_INTERVAL));
     }
 }