CVE-2024-35938 wifi: ath11k: decrease MHI channel buffer length to 8KB

In the Linux kernel, the following vulnerability has been resolved: wifi: ath11k: decrease MHI channel buffer length to 8KB Currently buflen field of ath11kmhiconfigqca6390 is assigned with 0, making MHI use a default size, 64KB, to allocate channel buffers. This is likely to fail in some scenari...