util/kconfig: Uprev to Linux 6.2's kconfig

The upstream build system uses a newly introduced function `read-file`,
so copy that in from Linux 6.2.

TEST=`util/abuild/abuild -C` output (config.h and config.build) remains
the same

Change-Id: Ic100bf189ebd3eaa0eb26904ae8602910329a180
Signed-off-by: Patrick Georgi <patrick@coreboot.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79179
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

util/kconfig/patches/0007-kconfig-Allow-KCONFIG_STRICT-outside-of-confdata.c.patch

@@ -102,7 +102,7 @@ Index: kconfig/mconf.c
  static const char mconf_readme[] =
  "Overview\n"
  "--------\n"
-@@ -948,6 +950,7 @@ static void conf_save(void)
+@@ -953,6 +955,7 @@ static void conf_save(void)
  static int handle_exit(void)
  {
  	int res;
@@ -110,7 +110,7 @@ Index: kconfig/mconf.c
  
  	save_and_exit = 1;
  	reset_subtitle();
-@@ -962,6 +965,13 @@ static int handle_exit(void)
+@@ -967,6 +970,13 @@ static int handle_exit(void)
  
  	end_dialog(saved_x, saved_y);
  

util/kconfig/patches/0013-util-kconfig-detect-ncurses-on-FreeBSD.patch

@@ -13,7 +13,7 @@ Index: kconfig/mconf-cfg.sh
 ===================================================================
 --- kconfig.orig/mconf-cfg.sh
 +++ kconfig/mconf-cfg.sh
-@@ -33,6 +33,12 @@ if [ -f /usr/include/ncurses/ncurses.h ]
+@@ -36,6 +36,12 @@ if [ -f /usr/include/ncurses/ncurses.h ]
  	exit 0
  fi