iwlwififw: add firmware for the Bz/B200 chipset

iwlwififw: add firmware for the Bz/B200 chipset

The iwlwifi driver already supports the chipset as "Bz TBD"
(also in 14.0).  Add the firmware for it.  Successfully tested
for 0x8086/0x272b/0x8086/0x00f4 on arm64 thanks to donated
hardware [1].

    Firmware was obtained from linux-firmware at
    9552083a783e5e48b90de674d4e3bf23bb855ab0 .

Sponsored by:	The FreeBSD Foundation
Sponsored by:	Martin Hoehne / minipci.biz (B200 card) [1]
Approved by:	re (cperciva)

(cherry picked from commit b647615ede46af66cd0c8bd5a321d4a2cccdabe0)
(cherry picked from commit d1d5dbcf2539d708d36cd4239ea428914a63321d)