util: rename uki-util.[ch] -> kernel-image.[ch]

As the file contains functions not only for UKI.

src/boot/bootctl-uki.c

@@ -2,7 +2,7 @@
 
 #include "alloc-util.h"
 #include "bootctl-uki.h"
-#include "uki-util.h"
+#include "kernel-image.h"
 
 int verb_kernel_identify(int argc, char *argv[], void *userdata) {
         KernelImageType t;

src/shared/kernel-image.c

@@ -2,11 +2,11 @@
 
 #include "fd-util.h"
 #include "env-file.h"
+#include "kernel-image.h"
 #include "os-util.h"
 #include "parse-util.h"
 #include "pe-header.h"
 #include "string-table.h"
-#include "uki-util.h"
 
 #define MAX_SECTIONS 96
 

src/shared/meson.build

@@ -91,6 +91,7 @@ shared_sources = files(
         'journal-util.c',
         'json.c',
         'kbd-util.c',
+        'kernel-image.c',
         'keyring-util.c',
         'killall.c',
         'label.c',
@@ -150,7 +151,6 @@ shared_sources = files(
         'tpm2-util.c',
         'udev-util.c',
         'uid-alloc-range.c',
-        'uki-util.c',
         'user-record-nss.c',
         'user-record-show.c',
         'user-record.c',