slw: Fix typo in FWTS annotation
slw: Fix typo in FWTS annotation

Update copyright header date at the same time

Suggested-by: Vaidyanathan Srinivasan <c012decff9dffda4c10860ab2ba9eb53320d90bc@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

open-power/skiboot,open-power/skiboot,legoater/skiboot,open-power/skiboot,legoater/skiboot,legoater/skiboot,open-power/skiboot,qemu/skiboot,stewart-ibm/skiboot,mikey/skiboot,legoater/skiboot,shenki/skiboot,qemu/skiboot,qemu/skiboot,open-power/skiboot,qemu/skiboot,shenki/skiboot,mikey/skiboot,shenki/skiboot,shenki/skiboot,stewart-ibm/skiboot,qemu/skiboot,mikey/skiboot,stewart-ibm/skiboot,legoater/skiboot,shenki/skiboot