kboot: Move str* util routines to libkboot

These are needed for the next round of EFI support for amd64 (partially
shared with aarch64, but only partially because the Linux host interfaces
are different to get the same info).

Sponsored by:		Netflix

stand/kboot/include/util.h

@@ -0,0 +1,10 @@
+/*-
+ * Copyright (c) 2022, Netflix, Inc.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+bool file2str(const char *fn, char *buffer, size_t buflen);
+bool file2u64(const char *fn, uint64_t *val);

stand/kboot/kboot/Makefile

@@ -25,7 +25,6 @@ SRCS=	\
 		hostfs.c \
 		init.c \
 		main.c \
-		util.c \
 		vers.c
 
 .if ${MK_FDT} != "no"

stand/kboot/kboot/kboot.h

@@ -33,10 +33,7 @@ const char *hostdisk_gen_probe(void);
 void hostdisk_zfs_probe(void);
 bool hostdisk_zfs_find_default(void);
 
-/* util.c */
-bool file2str(const char *fn, char *buffer, size_t buflen);
-bool file2u64(const char *fn, uint64_t *val);
-
 #include "seg.h"
+#include "util.h"
 
 #endif /* KBOOT_H */

stand/kboot/libkboot/Makefile

@@ -11,6 +11,7 @@ SRCS+=	host_syscall.S
 SRCS+=	host_syscalls.c
 SRCS+=	seg.c
 SRCS+=	termios.c
+SRCS+=	util.c
 
 .sinclude "${.CURDIR}/arch/${MACHINE_ARCH}/Makefile.inc"
 

stand/kboot/libkboot/util.c

@@ -6,7 +6,7 @@
 
 #include "stand.h"
 #include "host_syscall.h"
-#include "kboot.h"
+#include "util.h"
 
 bool
 file2str(const char *fn, char *buffer, size_t buflen)