wlcore: use u8 instead of enum for bcn_filt_mode

Since we will export the conf structure as a file, we need to use well
defined types.  Instead of using enum, whose size may vary, use u8 for
bcn_filt_mode instead.

Signed-off-by: Luciano Coelho <coelho@ti.com>
diff --git a/drivers/net/wireless/ti/wlcore/conf.h b/drivers/net/wireless/ti/wlcore/conf.h
index 2e84ae1..0950bd2 100644
--- a/drivers/net/wireless/ti/wlcore/conf.h
+++ b/drivers/net/wireless/ti/wlcore/conf.h
@@ -824,7 +824,7 @@
 	 *
 	 * Range: CONF_BCN_FILT_MODE_*
 	 */
-	enum conf_bcn_filt_mode bcn_filt_mode;
+	u8 bcn_filt_mode;
 
 	/*
 	 * Configure Beacon filter pass-thru rules.