fwts: Enable optional efi_runtime kernel module build

Firmware test suite does provides efi_runtime kernel module required
to run UEFI tests. So optionally enable this module build.

[Peter: fix -/_ in comment as suggested by Erico]
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/fwts/Config.in

@@ -21,6 +21,18 @@ config BR2_PACKAGE_FWTS
 
 	  https://wiki.ubuntu.com/FirmwareTestSuite
 
+if BR2_PACKAGE_FWTS
+config BR2_PACKAGE_FWTS_EFI_RUNTIME_MODULE
+	bool "efi_runtime module"
+	depends on BR2_LINUX_KERNEL
+	help
+	  Firmware Test Suite (FWTS) provides a EFI runtime kernel
+	  module required to run UEFI tests.
+
+comment "efi_runtime module needs a Linux kernel to be built"
+	depends on !BR2_LINUX_KERNEL
+endif
+
 comment "fwts needs a glibc toolchain w/ wchar, threads"
 	depends on BR2_i386 || BR2_x86_64 || BR2_aarch64
 	depends on BR2_PACKAGE_LIBBSD_ARCH_SUPPORTS # libbsd

package/fwts/fwts.mk

@@ -13,4 +13,9 @@ FWTS_AUTORECONF = YES
 FWTS_DEPENDENCIES = host-bison host-flex host-pkgconf json-c libglib2 libbsd \
 	$(if $(BR2_PACKAGE_DTC),dtc)
 
+ifdef BR2_PACKAGE_FWTS_EFI_RUNTIME_MODULE
+FWTS_MODULE_SUBDIRS = efi_runtime
+$(eval $(kernel-module))
+endif
+
 $(eval $(autotools-package))