Include or exclude most unpackaged firmware

For (almost) all the unpackaged firmware, either include them in a binary package or exclude them through debian/copyright:

• d/copyright: Exclude more undistributable rsi_91x firmware
• d/copyright: Exclude undistributable ti-tas2563 and ti-tas2781 firmware
• d/copyright: Exclude undistributable crypto_safexcel firmware
• d/copyright: Exclude more AMD firmware packaged in amd64-microcode
• d/copyright: Exclude more mlxsw firmware
• d/copyright: Exclude ixp4xx firmware for no-longer-supported SoCs
• d/copyright: Exclude firmware for unreleased R-Car H3 ES1 SoC
• d/b/check_upstream.py: Treat .txt files as being source code
• d/b/check_upstream.py: Match another wording of permission to redistribute
• atheros: Add ath12k firmware
• cirrus: Add snd-soc-cs42l43 firmware
• intel-graphics: Add intel-ipu6-isys, mei-vsc-hw, and xe firmware
• misc-nonfree: Add air_en8811h firmware
• misc-nonfree: Add powervr firmware
• misc-nonfree: Add more wfx firmware

This seems to leave just:

• amlogic/bluetooth/w1u_bt_fw_uart.bin
• amlogic/bluetooth/w2_bt_fw_uart.bin
• tsse_firmware.bin

which I couldn't make a decision on.