usb: typec: Send uevent for num_altmodes update

Generate a change uevent when the "number_of_alternate_modes" sysfs file
for partners and plugs is updated by a port driver.

Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Benson Leung <bleung@chromium.org>
Signed-off-by: NPrashant Malani <pmalani@chromium.org>
Link: https://lore.kernel.org/r/20210107034904.4112029-1-pmalani@chromium.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/class.c

@@ -766,6 +766,7 @@ int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmod
 		return ret;
 
 	sysfs_notify(&partner->dev.kobj, NULL, "number_of_alternate_modes");
+	kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
 
 	return 0;
 }
@@ -923,6 +924,7 @@ int typec_plug_set_num_altmodes(struct typec_plug *plug, int num_altmodes)
 		return ret;
 
 	sysfs_notify(&plug->dev.kobj, NULL, "number_of_alternate_modes");
+	kobject_uevent(&plug->dev.kobj, KOBJ_CHANGE);
 
 	return 0;
 }