sdbusplus: avoid deprecated phosphor::Timer

sdbusplus had an older type named `phosphor::Timer` which was
recently renamed to `sdbusplus::Timer`.  Update the code to use
the new type alias.

Change-Id: If69434b3a3639b8f97ab16cab5da4d70e3379cb2
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/host-cmd-manager.hpp b/host-cmd-manager.hpp
index cd96044..8937e43 100644
--- a/host-cmd-manager.hpp
+++ b/host-cmd-manager.hpp
@@ -102,7 +102,7 @@
     std::queue<CommandHandler> workQueue{};
 
     /** @brief Timer for commands to host */
-    phosphor::Timer timer;
+    sdbusplus::Timer timer;
 
     /** @brief Match handler for the requested host state */
     sdbusplus::bus::match_t hostTransitionMatch;