linux-firmware: add separate packages for all brcm files

linux-firmware: add separate packages for all brcm files

* no changes in the content of previously existing packages

* include some silly commands I've used to "parse" WHENCE file to
  generate these, some manual changes are still needed, like separating
  cypress licensed files, removing duplicates when 2 files are included
  in the same package (bcm4356-pcie is exception because sdio and pcie
  files have different license).

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>