nrf_wifi: src: Fix include file path

With recent code restructuring file name and path
has been changed in nrf_wifi lib.

Signed-off-by: Kapil Bhatt <kapil.bhatt@nordicsemi.no>

Author: kapbh

drivers/wifi/nrf_wifi/src/coex.c

@@ -17,7 +17,7 @@
 #include "coex.h"
 #include "coex_struct.h"
 #include "fmac_main.h"
-#include "fmac_api.h"
+#include "common/fmac_api_common.h"
 
 LOG_MODULE_DECLARE(wifi_nrf, CONFIG_WIFI_NRF70_LOG_LEVEL);