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/phosphor-power-supply/util.hpp b/phosphor-power-supply/util.hpp
index 58bab67..dc28ffe 100644
--- a/phosphor-power-supply/util.hpp
+++ b/phosphor-power-supply/util.hpp
@@ -41,7 +41,6 @@
     void setPresence(sdbusplus::bus_t& bus, const std::string& invpath,
                      bool present, const std::string& name) const override
     {
-        using namespace phosphor::logging;
         lg2::info("Updating inventory present property. "
                   "present:{PRESENT} invpath:{INVPATH} name:{NAME}",
                   "PRESENT", present, "INVPATH", invpath, "NAME", name);
@@ -81,7 +80,7 @@
             lg2::error(
                 "Error in inventory manager call to update inventory: {ERROR}",
                 "ERROR", e);
-            elog<InternalFailure>();
+            phosphor::logging::elog<InternalFailure>();
         }
     }
 
@@ -110,7 +109,6 @@
         }
         catch (const sdbusplus::exception_t& e)
         {
-            using namespace phosphor::logging;
             lg2::error("Error in inventory manager call to update "
                        "availability interface: {ERROR}",
                        "ERROR", e);
@@ -181,7 +179,6 @@
         }
         catch (const sdbusplus::exception_t& e)
         {
-            using namespace phosphor::logging;
             lg2::info("Error trying to handle health rollup "
                       "associations for {INVPATH}: {ERROR}",
                       "INVPATH", invpath, "ERROR", e);