watchdog: Use ResetTimeRemaining for wd_reset

Using this helper method reduces the number of dbus calls made during
each watchdog reset.

Change-Id: I373db3babe03e05fca33eb4dbbbc7c07f95a39ea
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/app/watchdog.cpp b/app/watchdog.cpp
index c1f25ac..dbd7426 100644
--- a/app/watchdog.cpp
+++ b/app/watchdog.cpp
@@ -40,12 +40,8 @@
             return IPMI_WDOG_CC_NOT_INIT;
         }
 
-        // Reset the countdown to make sure we don't expire our timer
-        wd_service.setTimeRemaining(wd_prop.interval);
-
-        // The spec states that the timer is activated by reset
-        wd_service.setEnabled(true);
-
+        // The ipmi standard dictates we enable the watchdog during reset
+        wd_service.resetTimeRemaining(true);
         return IPMI_CC_OK;
     }
     catch (const InternalFailure& e)