ensure proper data types for variants

New upstream yocto compiler is failing due to different data types on
the variants. Make it explicit.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: Ifb81121695d9fe72d6a7fc7b363dec7507e7f4dd
diff --git a/storagehandler.cpp b/storagehandler.cpp
index 905d0b7..e4b43dd 100644
--- a/storagehandler.cpp
+++ b/storagehandler.cpp
@@ -539,7 +539,7 @@
     {
         sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
         auto service = ipmi::getService(bus, TIME_INTERFACE, HOST_TIME_PATH);
-        std::variant<uint64_t> value{usec.count()};
+        std::variant<uint64_t> value{(uint64_t)usec.count()};
 
         // Set host time
         auto method = bus.new_method_call(service.c_str(), HOST_TIME_PATH,