qcacld-3.0: Disable the export symbols in the driver

Currently the export symbols are enabled in the driver
which is increasing the text section of driver.

Since driver does not need export symbols, disable it.

Change-Id: I463835107fc2a86ee6b4ab36edc75571f644499f
CRs-Fixed: 2462388

configs/default_defconfig

@@ -111,6 +111,9 @@ CONFIG_WLAN_SYSFS := y
 CONFIG_FEATURE_BECN_STATS := y
 endif
 
+#Disable the Export Symbol config
+CONFIG_WLAN_DISABLE_EXPORT_SYMBOL := y
+
 CONFIG_QCACLD_FEATURE_GREEN_AP := y
 CONFIG_CRYPTO_COMPONENT := y
 #Flag to enable Android Packet Filtering