util/kconfig: Uprev to Linux 5.17's kconfig

Another upstream refactoring, another local patch gone!

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

Change-Id: I0f99dcbd8ecc7256551f0a6e2c83c060cb1999b6
Signed-off-by: Patrick Georgi <patrick@coreboot.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66046
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

util/kconfig/patches/0001-Kconfig-Add-KCONFIG_STRICT-mode.patch

@@ -19,7 +19,7 @@ Index: kconfig/confdata.c
 ===================================================================
 --- kconfig.orig/confdata.c
 +++ kconfig/confdata.c
-@@ -428,6 +428,7 @@ load:
+@@ -430,6 +430,7 @@ load:
  			if (def == S_DEF_USER) {
  				sym = sym_find(line + 2 + strlen(CONFIG_));
  				if (!sym) {
@@ -27,7 +27,7 @@ Index: kconfig/confdata.c
  					conf_set_changed(true);
  					continue;
  				}
-@@ -510,6 +511,13 @@ load:
+@@ -512,6 +513,13 @@ load:
  	}
  	free(line);
  	fclose(in);