linux-firmware: create separate packages

This is in continuation of earlier commit:
3ddddfc14f805fe7572bba129605869fb848fed4
linux-firmware: create separate package for cirrus and cnm firmwares

And creates separate sub packages for firmwares corresponding to following list of
licenses:
LICENSE.amphion_vpu
LICENCE.cw1200
LICENSE.ice_enhanced
LICENCE.mediatek
LICENCE.microchip
LICENCE.moxa
LICENSE.nxp_mc_firmware
LICENCE.OLPC
LICENCE.phanfw
LICENCE.qla2xxx
LICENCE.ti-keystone
LICENCE.wl1251
LICENCE.xc4000
LICENCE.xc5000
LICENCE.xc5000c

Signed-off-by: Fahad Arslan <fahad.arslan@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit c110e570)
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>