logging: switch to lg2

After switching to C++20, it is recommended to use `phosphor::lg2`
to format log, and the correct `CODE_LINE` and `CODE_FUNC` values
can be used in log tracking.

Tested: built biosConfigManager successfully.
journalctl -o json-pretty SYSLOG_IDENTIFIER=biosconfig-manager
{
 "_TRANSPORT" : "journal",
 "_PID" : "244",
 "__MONOTONIC_TIMESTAMP" : "513878067",
 "_SYSTEMD_SLICE" : "system.slice",
 "CODE_LINE" : "123",
 "_SOURCE_REALTIME_TIMESTAMP" : "513877941",
 "_HOSTNAME" : "fp5280g2",
 "_CAP_EFFECTIVE" : "1ffffffffff",
 "_BOOT_ID" : "40382c3612f54e1a96a6ecf41fe6b38e",
 "SYSLOG_IDENTIFIER" : "biosconfig-manager",
 "_CMDLINE" : "/usr/bin/biosconfig-manager",
 "_EXE" : "/usr/bin/biosconfig-manager",
 "LOG2_FMTMSG" : "BIOS attribute not found in the BaseBIOSTable",
 "_SYSTEMD_UNIT" : "xyz.openbmc_project.biosconfig_manager.service",
 "MESSAGE" : "BIOS attribute not found in the BaseBIOSTable",
 "PRIORITY" : "3",
 "CODE_FILE" : "../biosconfig-manager/src/manager.cpp",
 "CODE_FUNC" : "virtual bios_config::Manager::PendingAttributes
                bios_config::Manager::pendingAttributes
               (bios_config::Manager::PendingAttributes)"
...
}

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I274d61827279b10ba3fe9d61404ce8b654ccdd9e
diff --git a/src/manager_serialize.cpp b/src/manager_serialize.cpp
index 0756006..18163b7 100644
--- a/src/manager_serialize.cpp
+++ b/src/manager_serialize.cpp
@@ -7,15 +7,13 @@
 #include <cereal/types/tuple.hpp>
 #include <cereal/types/variant.hpp>
 #include <cereal/types/vector.hpp>
-#include <phosphor-logging/log.hpp>
+#include <phosphor-logging/lg2.hpp>
 
 #include <fstream>
 
 namespace bios_config
 {
 
-using namespace phosphor::logging;
-
 /** @brief Function required by Cereal to perform serialization.
  *
  *  @tparam Archive - Cereal archive type (binary in this case).
@@ -77,13 +75,13 @@
     }
     catch (cereal::Exception& e)
     {
-        log<level::ERR>(e.what());
+        lg2::error("Failed to serialize: {ERROR}", "ERROR", e);
         fs::remove(path);
         return false;
     }
     catch (const std::length_error& e)
     {
-        log<level::ERR>(e.what());
+        lg2::error("Failed to serialize: {ERROR}", "ERROR", e);
         fs::remove(path);
         return false;
     }