We do this as a result of an upstream issue[1].
Some of the firmware blobs are provided under the 'Synapse' license
including a clause that can (at least theoretically) be used as a
'killswitch'. To make sure users are aware of this, we guard this
behind a license flag.
Users of this recipe will need to add to their configuration:
LICENSE_FLAGS_ACCEPTED = "synaptics-killswitch"
[1] https://github.com/RPi-Distro/firmware-nonfree/issues/29
Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>
