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: I694f0624eae2cdbb071ab97fe019cd5684615541
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/src/firmware-update.cpp b/src/firmware-update.cpp
index 9bde818..93e9078 100644
--- a/src/firmware-update.cpp
+++ b/src/firmware-update.cpp
@@ -562,10 +562,10 @@
     std::unique_ptr<sdbusplus::bus::match_t>& fwUpdateMatchSignal)
 {
     // Setup timer for watching signal
-    static phosphor::Timer timer(
+    static sdbusplus::Timer timer(
         [&fwUpdateMatchSignal]() { fwUpdateMatchSignal = nullptr; });
 
-    static phosphor::Timer activationStatusTimer([]() {
+    static sdbusplus::Timer activationStatusTimer([]() {
         if (fwUpdateStatus.activationTimerTimeout() > 95)
         {
             activationStatusTimer.stop();