ath10k: QCA6174 hw2.1: add board-2.bin

This file uses the new format which contains multiple board files for various
boards.
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Kyle McMartin <kyle@kernel.org>

WHENCE

@@ -2550,6 +2550,7 @@ File: ath10k/QCA988X/hw2.0/firmware-5.bin
 Version: 10.2.4.70.9-2
 Licence: ath10k/QCA988X/hw2.0/notice_ath10k_firmware-5.txt
 File: ath10k/QCA6174/hw2.1/board.bin
+File: ath10k/QCA6174/hw2.1/board-2.bin
 File: ath10k/QCA6174/hw2.1/firmware-5.bin
 Version: SW_RM.1.1.1-00157-QCARMSWPZ-1
 Licence: ath10k/QCA6174/hw2.1/notice_ath10k_firmware-5.txt