linux-firmware: update firmware for mediatek bluetooth chip (MT7921) Update binary firmware for MT7921 BT devices. * Support SCO over I2S/PCM File: mediatek/BT_RAM_CODE_MT7961_1_2_hdr.bin Version: 20211222191101 Signed-off-by: Mark Chen <mark-yw.chen@mediatek.com> Signed-off-by: Josh Boyer <jwboyer@kernel.org>