iwlagn: add dumpit support for testmode trace function

For testmode trace function, huge amout of data need to pass to userspace.
Use the build-in nl80211 dumpt it function

Require nl80211 testmode dumpit support patch.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index a7d2159..d23430e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1172,6 +1172,7 @@
 struct iwl_testmode_trace {
 	u32 buff_size;
 	u32 total_size;
+	u32 num_chunks;
 	u8 *cpu_addr;
 	u8 *trace_addr;
 	dma_addr_t dma_addr;