wifi: ath12k: Fix endianness issue in struct hal_tlv_64_hdr

wifi: ath12k: Fix endianness issue in struct hal_tlv_64_hdr

struct hal_tlv_64_hdr has a 64-bit member that should be in little-endian
format, but the current definition uses host byte order. Fix this by
changing the definition and updating the corresponding helper functions
used for the byte order conversion.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Signed-off-by: P Praneesh <quic_ppranees@quicinc.com>
Acked-by: Kalle Valo <kvalo@kernel.org>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://patch.msgid.link/20241119164516.756478-1-quic_ppranees@quicinc.com
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>