qcn6122: Add BDF for Linksys MX6200

Add QCN6122 board file for Linksys MX6200.
The BDF was edited to update to template version 3.4.0, to remove
regdomain, and update to the regdb taken from:
WLAN.HK.2.12-01460-QCAHKSWPL_SILICONZ-1 v1

It contains both board files for the 5G and 6G radios:

ath11k-bdencoder -i board-linksys_mx6200.qcn6122
FileSize: 262340
FileCRC32: 6bf5d575
FileMD5: 1e7490f9ebafb2973db598ad335ef70a
BoardNames[0]: 'bus=ahb,qmi-chip-id=0,qmi-board-id=255,variant=Linksys-MX6200-5G'
BoardLength[0]: 131072
BoardCRC32[0]: 5200b103
BoardMD5[0]: 215cfa10098c4c9c5eb4e854b8b2bb28
BoardNames[1]: 'bus=ahb,qmi-chip-id=0,qmi-board-id=255,variant=Linksys-MX6200-6G'
BoardLength[1]: 131072
BoardCRC32[1]: b6ce3838
BoardMD5[1]: 351cf945eddc2f5011e3c56b488a7cf6

Signed-off-by: George Moussalem <george.moussalem@outlook.com>
Link: #117
Signed-off-by: Robert Marko <robimarko@gmail.com>

Author: georgemoussalem