tree-wide: Sort includes

This was done by running a locally built clang-format with
https://github.com/llvm/llvm-project/pull/137617 and
https://github.com/llvm/llvm-project/pull/137840 applied on all .c
and .h files.

src/oom/oomd-manager-bus.c

@@ -6,8 +6,8 @@
 #include "bus-polkit.h"
 #include "fd-util.h"
 #include "memfd-util.h"
-#include "oomd-manager-bus.h"
 #include "oomd-manager.h"
+#include "oomd-manager-bus.h"
 #include "user-util.h"
 
 static int bus_method_dump_by_fd(sd_bus_message *message, void *userdata, sd_bus_error *error) {

src/oom/oomd-manager.c

@@ -15,8 +15,8 @@
 #include "memory-util.h"
 #include "memstream-util.h"
 #include "oomd-conf.h"
-#include "oomd-manager-bus.h"
 #include "oomd-manager.h"
+#include "oomd-manager-bus.h"
 #include "path-util.h"
 #include "percent-util.h"
 #include "varlink-io.systemd.oom.h"

src/oom/oomd.c

@@ -12,8 +12,8 @@
 #include "log.h"
 #include "main-func.h"
 #include "oomd-conf.h"
-#include "oomd-manager-bus.h"
 #include "oomd-manager.h"
+#include "oomd-manager-bus.h"
 #include "parse-util.h"
 #include "pretty-print.h"
 #include "psi-util.h"