mwifiex: add calibration data download feature

User can provide a text file containing calibration data in hex
format while loading mwifiex module. It will be downloaded to
firmware.
eg. insmod mwifiex.ko cal_data_cfg=cal_data.conf

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h
index 9cf6852..0832c24 100644
--- a/drivers/net/wireless/mwifiex/main.h
+++ b/drivers/net/wireless/mwifiex/main.h
@@ -730,6 +730,7 @@
 	u16 max_mgmt_ie_index;
 	u8 scan_delay_cnt;
 	u8 empty_tx_q_cnt;
+	const struct firmware *cal_data;
 
 	/* 11AC */
 	u32 is_hw_11ac_capable;