linux-firmware: add carl9170 firmware

GPLv2 firmware for carl9170, Atheros AR9170 802.11 draft-n USB driver.

Cc: Christian Lamparter <chunkeey@googlemail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Xose Vazquez Perez <xose.vazquez@gmail.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
carl9170: Add full licence texts to BSD-licenced CMake files

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
carl9170: Fix minimum CMake version

The CMAKE_CURRENT_LIST_DIR command was added in version 2.8.4.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
carl9170: Add and check SHA-256 sums for the toolchain tarballs

The sums for binutils and gcc are based on an HTTPS download (instead
of the default HTTP).

newlib doesn't seem to be available with any kind of signature, so I
compared a tarball and CVS checkout; let's hope they weren't both
compromised.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
carl9170: Add checksum during installation, as preferred by the driver

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
carl9170: Install binary in the parent directory, not /lib/firmware

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Move sd8688*.bin images into mrvl/ tree

They are (unlike rest of sd8xxx images from libertas/ and mrvl/) not Libertas
WiFi specific and are used for the bluetooth controller (btmrvl) which does not
look for them in libertas/.

Provide a compatibility symbolic link to avoid breaking libertas_sdio drivers
that are already in use.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>