Let usr/gen_init_cpio be built also if there is no kernel configuration.

Askar Safin reported that gen_init_cpio may be of use before any kernel
configuration is available.  Add usr_gen_init_cpio to list of targets
that do not require a .config file.

Reported-by: Askar Safin <safinaskar@gmail.com>
Closes: https://lore.kernel.org/all/20260220191150.244006-1-safinaskar@gmail.com
Fixes: f8e05c10631e ("kbuild: Add top-level target for building gen_init_cpio")
Signed-off-by: Nicolas Schier <nsc@kernel.org>
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index e944c6e71e81..0e788ce45457 100644
--- a/Makefile
+++ b/Makefile
@@ -296,6 +296,7 @@ no-dot-config-targets := $(clean-targets) \
 			 $(version_h) headers headers_% archheaders archscripts \
 			 %asm-generic kernelversion %src-pkg dt_binding_check \
 			 outputmakefile rustavailable rustfmt rustfmtcheck \
+			 usr_gen_init_cpio \
 			 run-command
 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
 			  image_name

-- 
2.51.0