Fix the issue when the driver always gets compiled as a module.
How to reproduce the issue:
	make mrproper
	make defconfig

	./scripts/config \
	  -e CMA \
	  -e ALLOC \
	  -e KVM \
	  -e KVM_INTEL \
	  -e KVM_INTEL_TDX \
	  -e INTEL_TDX_HOST \
	  -e TDX_HOST_SERVICES \
	  --refresh
	make olddefconfig
	make mod2yesconfig
	grep '=m$' .config

	returns only this driver as module:
	  CONFIG_TDX_HOST_SERVICES=m

"make menuconfig" doesn't let switch from =m to =y either.

Signed-off-by: Dmitry Voytik <voytikd@gmail.com>
---
 drivers/virt/coco/tdx-host/Kconfig | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/virt/coco/tdx-host/Kconfig b/drivers/virt/coco/tdx-host/Kconfig
index 57d0c01a4357..5a13ec6f51e8 100644
--- a/drivers/virt/coco/tdx-host/Kconfig
+++ b/drivers/virt/coco/tdx-host/Kconfig
@@ -1,6 +1,10 @@
 config TDX_HOST_SERVICES
-	tristate
+	tristate "TDX host user interface driver"
 	depends on INTEL_TDX_HOST
 	select FW_LOADER
 	select FW_UPLOAD
 	default m
+	help
+	  See INTEL_TDX_HOST for details.
+
+	  If unsure, say N.
-- 
2.55.0