linux-firmware: fix the mess of licenses

linux-firmware: fix the mess of licenses

Each firmware has their own license, it was a kind of a mess to
leave the license as Proprietary and we got a lot warnings like:

WARNING: The license listed Firmware-atheros_firmware was not in the
licenses collected for linux-firmware

To fix this and make it more clear:
- Fix some incorrect license names.
- Add all license files into common-licenses in previous commit.
- Add all licenses and their md5 values in alphabetical order.
- Add pn-*-license to split up per firmware package and pn-license for others.
- Re-order the codes for each split-out firmware as:
  LICENSE_*, FILES_*, RDEPENDS_*

[YOCTO #7539]

(From OE-Core rev: 1ee083da0730408fffdbbf5f29abc299c0e61be9)

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>