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 ledManager successfully and Unit Test passes.

Before: The file does not exist or is empty
After: The file does not exist or is empty, FILE_PATH = /usr/share/phosphor-led-manager/lamp-test-led-overrides.json

MESSAGE=File does not exist, FILE_PATH = /var/lib/phosphor-led-manager/savedGroups
LOG2_FMTMSG=File does not exist, FILE_PATH = {PATH}
CODE_FILE=../../../../../../fp5280g2-workspace/sources/phosphor-led-manager/serialize.cpp
CODE_LINE=63
CODE_FUNC=void phosphor::led::Serialize::restoreGroups()
PATH=/var/lib/phosphor-led-manager/savedGroups
SYSLOG_IDENTIFIER=phosphor-ledmanager
_PID=298
_COMM=phosphor-ledman
_EXE=/usr/bin/phosphor-ledmanager
_CMDLINE=phosphor-ledmanager
_SYSTEMD_CGROUP=/system.slice/xyz.openbmc_project.LED.GroupManager.service
_SYSTEMD_UNIT=xyz.openbmc_project.LED.GroupManager.service
_SYSTEMD_INVOCATION_ID=5ddd4960a3b04fe29c34e4ce03b6be06

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I5ec8530e0b539bcf8d7d211c802430698aebd343
8 files changed