ath6kl: use firmware version from FW IE

Need to have different FW versioning for different FW binaries.
This is handled by appending different meta data in firmware
binaries.

kvalo: add an empty line before a debug message, use '0' instead of '0x00',
fix indentation

Signed-off-by: Naveen Singh <navesing@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>