kas: added the synaptics-killswitch license in comment

I leave it to the user to allow the license by uncomment it.

Signed-off-by: Jan Vermaete <jan.vermaete@gmail.com>

kas-poky-rpi.yml

@@ -59,3 +59,7 @@ local_conf_header:
         HALT,${DL_DIR},100M,1K \
         HALT,${SSTATE_DIR},100M,1K \
         HALT,/tmp,10M,1K"
+  license: |
+    # Uncomment next line to allow the license
+    # See: linux-firmware-rpidistro in docs/ipcompliance.md
+    #LICENSE_FLAGS_ACCEPTED = "synaptics-killswitch"