Cleanup old logging headers and namespaces

Remove the header includes for the old phosphor::logging::log API
as well as unnecessary phosphor::logging namespace declarations.
Fully qualify phosphor::logging namespace where applicable and/or
needed.

Tested:
* Verified commit passed CI unit tests.
* Verified commit built using bitbake.

Change-Id: Ibf35b653192054e8654366ee09842992a598d9af
Signed-off-by: Anwaar Hadi <anwaar.hadi@ibm.com>
diff --git a/power-sequencer/pgood_monitor.cpp b/power-sequencer/pgood_monitor.cpp
index acceb6b..d1a80c2 100644
--- a/power-sequencer/pgood_monitor.cpp
+++ b/power-sequencer/pgood_monitor.cpp
@@ -31,7 +31,6 @@
 constexpr auto POWER_OBJ_PATH = "/org/openbmc/control/power0";
 constexpr auto POWER_INTERFACE = "org.openbmc.control.Power";
 
-using namespace phosphor::logging;
 using namespace sdbusplus::org::open_power::Witherspoon::Fault::Error;
 
 bool PGOODMonitor::pgoodPending()
@@ -70,7 +69,7 @@
 #ifdef DEVICE_ACCESS
         device->onFailure();
 #endif
-        report<PowerOnFailure>();
+        phosphor::logging::report<PowerOnFailure>();
     }
 
     // The pgood-wait service (with a longer timeout)