logging: replace direct journal calls with lg2

Tested:

Created a bogus journal message equivalent to the one in
TachSensor.hpp as the first line of 'main' in FanMain.cpp:

```
    auto device = "FooBar";
    auto msg = "OpenBMC.0.1.FanInserted";
    lg2::error("Fan Inserted", "REDFISH_MESSAGE_ID", msg,
               "REDFISH_MESSAGE_ARGS", device);
```

Observed the following in the journal:
```
{
	"_MACHINE_ID" : "115e76f3bc47411eb0f20075b13444e9",
	"_CMDLINE" : "/usr/bin/fansensor",
	"REDFISH_MESSAGE_ID" : "OpenBMC.0.1.FanInserted",
	"CODE_LINE" : "463",
	"_COMM" : "fansensor",
	"_EXE" : "/usr/bin/fansensor",
	"_SOURCE_REALTIME_TIMESTAMP" : "33256618",
	"__MONOTONIC_TIMESTAMP" : "33256849",
	"SYSLOG_IDENTIFIER" : "fansensor",
	"PRIORITY" : "3",
	"_CAP_EFFECTIVE" : "1ffffffffff",
	"_PID" : "296",
	"_UID" : "0",
	"_SYSTEMD_UNIT" : "xyz.openbmc_project.fansensor.service",
	"REDFISH_MESSAGE_ARGS" : "FooBar",
	"__REALTIME_TIMESTAMP" : "33256822",
	"LOG2_FMTMSG" : "Fan Inserted",
	"_SYSTEMD_CGROUP" : "/system.slice/xyz.openbmc_project.fansensor.service",
	"_GID" : "0",
	"_TRANSPORT" : "journal",
	"__CURSOR" : "s=039afc05fc934fe08b77dd73c4092591;i=1ff;b=5ad25f16b9bd424ebe72cf30558fcdc2;m=1fb7591;t=1fb7576;x=617adeeaf1da9edc",
	"CODE_FILE" : "../../../../../../../../sync/openbmc-sources/dbus-sensors/src/FanMain.cpp",
	"_SYSTEMD_INVOCATION_ID" : "9eef21c4b7784ba2aa2628f162079cd3",
	"CODE_FUNC" : "int main()",
	"MESSAGE" : "Fan Inserted",
	"_HOSTNAME" : "bletchley",
	"_SYSTEMD_SLICE" : "system.slice",
	"_BOOT_ID" : "5ad25f16b9bd424ebe72cf30558fcdc2"
}
```

Observed the following in /var/log/redfish:
```
1970-01-01T00:00:27.345477+00:00 OpenBMC.0.1.FanInserted,FooBar
```

Observed the following in Redfish:
```
{
      "@odata.id": "/redfish/v1/Systems/system/LogServices/EventLog/Entries/27",
      "@odata.type": "#LogEntry.v1_4_0.LogEntry",
      "Created": "1970-01-01T00:00:27+00:00",
      "EntryType": "Event",
      "Id": "27",
      "Message": "FooBar inserted.",
      "MessageArgs": [
        "FooBar"
      ],
      "MessageId": "OpenBMC.0.1.FanInserted",
      "Name": "System Event Log Entry",
      "Severity": "OK"
    }
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ib408e97ff99863cd91bcbcb43a4738d773f4e21c
diff --git a/meson.build b/meson.build
index 0548596..48dce71 100644
--- a/meson.build
+++ b/meson.build
@@ -67,6 +67,7 @@
 
 default_deps = [
     nlohmann_json,
+    phosphor_logging_dep,
     sdbusplus,
 ]