use std::format instead of fmt::format

The std::format is sufficient for the uses in this repository except
for in one file (override_fan_target.cpp, since P2286 isn't supported
by GCC yet).  Switch to std::format whenever possible.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ib2576fb530a4d7ce238e1b0bd95b40b476ec2107
diff --git a/sensor-monitor/threshold_alarm_logger.cpp b/sensor-monitor/threshold_alarm_logger.cpp
index 99ed0d6..13058e7 100644
--- a/sensor-monitor/threshold_alarm_logger.cpp
+++ b/sensor-monitor/threshold_alarm_logger.cpp
@@ -17,12 +17,13 @@
 
 #include "sdbusplus.hpp"
 
-#include <fmt/format.h>
 #include <unistd.h>
 
 #include <phosphor-logging/log.hpp>
 #include <xyz/openbmc_project/Logging/Entry/server.hpp>
 
+#include <format>
+
 namespace sensor::monitor
 {
 
@@ -284,7 +285,7 @@
     if (properties == it->second.end())
     {
         log<level::INFO>(
-            fmt::format("Could not find {} in threshold alarms map",
+            std::format("Could not find {} in threshold alarms map",
                         alarmProperty)
                 .c_str());
         return;
@@ -301,7 +302,7 @@
         ad.emplace("SENSOR_VALUE", std::to_string(sensorValue));
 
         log<level::INFO>(
-            fmt::format("Threshold Event {} {} = {} (sensor value {})",
+            std::format("Threshold Event {} {} = {} (sensor value {})",
                         sensorPath, alarmProperty, alarmValue, sensorValue)
                 .c_str());
     }
@@ -311,7 +312,7 @@
         // not be in the mapper yet.  This could only happen if the sensor
         // application was started up after this one and the value exceeded the
         // threshold immediately.
-        log<level::INFO>(fmt::format("Threshold Event {} {} = {}", sensorPath,
+        log<level::INFO>(std::format("Threshold Event {} {} = {}", sensorPath,
                                      alarmProperty, alarmValue)
                              .c_str());
     }
@@ -341,7 +342,7 @@
     if ((sensorPath.back() == '/') || (pos == std::string::npos))
     {
         log<level::ERR>(
-            fmt::format("Cannot get sensor type from sensor path {}",
+            std::format("Cannot get sensor type from sensor path {}",
                         sensorPath)
                 .c_str());
         throw std::runtime_error("Invalid sensor path");