fsp-sensor: add a label property for the ambient sensor
fsp-sensor: add a label property for the ambient sensor

Signed-off-by: Cédric Le Goater <2d8cace2254d4e43578d21933db015d84bcc468a@fr.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

stewart-ibm/skiboot,qemu/skiboot,mikey/skiboot,qemu/skiboot,shenki/skiboot,ddstreet/skiboot,legoater/skiboot,shenki/skiboot,csmart/skiboot,legoater/skiboot,qemu/skiboot,stewart-ibm/skiboot,open-power/skiboot,qemu/skiboot,legoater/skiboot,apopple/skiboot,jk-ozlabs/skiboot,mikey/skiboot,ddstreet/skiboot,apopple/skiboot,open-power/skiboot,jk-ozlabs/skiboot,open-power/skiboot,shenki/skiboot,mikey/skiboot,open-power/skiboot,ddstreet/skiboot,legoater/skiboot,csmart/skiboot,csmart/skiboot,qemu/skiboot,open-power/skiboot,apopple/skiboot,legoater/skiboot,shenki/skiboot,jk-ozlabs/skiboot,stewart-ibm/skiboot,shenki/skiboot