package/v4l2loopback: add V4L2LOOPBACK_LINUX_CONFIG_FIXUPS

Fix the following build failure:

ERROR: modpost: "video_ioctl2" [/nvmedata/autobuild/instance-10/output-1/build/v4l2loopback-0.12.5/./v4l2loopback.ko] undefined!
ERROR: modpost: "__video_register_device" [/nvmedata/autobuild/instance-10/output-1/build/v4l2loopback-0.12.5/./v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_ctrl_new_custom" [/nvmedata/autobuild/instance-10/output-1/build/v4l2loopback-0.12.5/./v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_ctrl_handler_init_class" [/nvmedata/autobuild/instance-10/output-1/build/v4l2loopback-0.12.5/./v4l2loopback.ko] undefined!
ERROR: modpost: "video_device_alloc" [/nvmedata/autobuild/instance-10/output-1/build/v4l2loopback-0.12.5/./v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_device_register" [/nvmedata/autobuild/instance-10/output-1/build/v4l2loopback-0.12.5/./v4l2loopback.ko] undefined!
ERROR: modpost: "video_device_release" [/nvmedata/autobuild/instance-10/output-1/build/v4l2loopback-0.12.5/./v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_ctrl_handler_free" [/nvmedata/autobuild/instance-10/output-1/build/v4l2loopback-0.12.5/./v4l2loopback.ko] undefined!
ERROR: modpost: "v4l2_device_unregister" [/nvmedata/autobuild/instance-10/output-1/build/v4l2loopback-0.12.5/./v4l2loopback.ko] undefined!
ERROR: modpost: "video_unregister_device" [/nvmedata/autobuild/instance-10/output-1/build/v4l2loopback-0.12.5/./v4l2loopback.ko] undefined!

Fixes:
 - http://autobuild.buildroot.org/results/640f8f61c7f433ffe5e9a6759eecc9a03f735569

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit aa61d29b84be8e32022a68c3c4055300a97d581b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/v4l2loopback/v4l2loopback.mk

@@ -15,5 +15,15 @@ define V4L2LOOPBACK_INSTALL_TARGET_CMDS
 endef
 endif
 
+# CONFIG_MEDIA_SUPPORT depends on CONFIG_HAS_IOMEM, which is only
+# available when CONFIG_PCI=y on S390. CONFIG_VIDEO_DEV needs
+# CONFIG_I2C since Linux 5.18.
+define V4L2LOOPBACK_LINUX_CONFIG_FIXUPS
+	$(if $(BR2_s390x),$(call KCONFIG_ENABLE_OPT,CONFIG_PCI))
+	$(call KCONFIG_ENABLE_OPT,CONFIG_MEDIA_SUPPORT)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_I2C)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_VIDEO_DEV)
+endef
+
 $(eval $(kernel-module))
 $(eval $(generic-package))