wifi: ath10k: use = {} to initialize pm_qos_request instead of memset

wifi: ath10k: use = {} to initialize pm_qos_request instead of memset

Initialize the pm_qos_request structure using = {} instead of memset() in
ath10k_download_fw(). This ensures the structure is properly zeroed before
passing it to cpu_latency_qos_add_request(), and improves efficiency by
avoiding an explicit runtime memset.

Signed-off-by: Zhongqiu Han <zhongqiu.han@oss.qualcomm.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20251030130023.1836808-2-zhongqiu.han@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>