Separate 300KB wfx firmware from the rest of linux-firmware package.
With this change the wfx/LICENCE.wf200 is really packaged, before the
change it didn't fall into copying wildcard.
(From OE-Core rev: 48e14565abcfe0ec8eb21b1c3e6108bb5b0a0b7c)
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>