api: Add unix_device_hotplug_subsystem_device_option extension

Signed-off-by: Kadin Sayani <kadin.sayani@canonical.com>

Author: kadinsayani

doc/api-extensions.md

@@ -2531,3 +2531,7 @@ This adds scope metadata to `GET /1.0/metadata/configuration`. Options marked wi
 ## `unix_device_hotplug_ownership_inherit`
 
 Adds a new {config:option}`device-unix-hotplug-device-conf:ownership.inherit` configuration option for `unix-hotplug` devices. This option controls whether the device inherits ownership (GID and/or UID) from the host. When set to `true` and GID and/or UID are unset, host ownership is inherited. When set to `false`, host ownership is not inherited and ownership can be configured by setting {config:option}`device-unix-hotplug-device-conf:gid` and {config:option}`device-unix-hotplug-device-conf:uid`.
+
+## `unix_device_hotplug_subsystem_device_option`
+
+Adds a new {config:option}`device-unix-hotplug-device-conf:subsystem` configuration option for `unix-hotplug` devices. This adds support for detecting `unix-hotplug` devices by subsystem, and can be used in conjunction with {config:option}`device-unix-hotplug-device-conf:productid` and {config:option}`device-unix-hotplug-device-conf:vendorid`.

shared/version/api.go

@@ -426,6 +426,7 @@ var APIExtensions = []string{
 	"images_all_projects",
 	"metadata_configuration_scope",
 	"unix_device_hotplug_ownership_inherit",
+	"unix_device_hotplug_subsystem_device_option",
 }
 
 // APIExtensionsCount returns the number of available API extensions.