qcacld-3.0: Fix errors of multi driver compilation

Qcacld supports multiple driver modules instance generation with
different file names and Kbuild options. Fix driver load time and
compilation errors on this feature.

Change-Id: Ib405e6c475bace31933a28dc64082f2b6c046da9
CRs-fixed: 2197749
diff --git a/Kbuild b/Kbuild
index 9c6a78e..a48a9e4 100644
--- a/Kbuild
+++ b/Kbuild
@@ -1807,6 +1807,9 @@
 		-DWLAN_SPECTRAL_ENABLE \
 		-DWMI_CMD_STRINGS
 
+ifeq ($(CONFIG_WLAN_DISABLE_EXPORT_SYMBOL), y)
+CDEFINES += -DWLAN_DISABLE_EXPORT_SYMBOL
+endif
 
 ############ WIFI POS ##############
 ifeq ($(CONFIG_WIFI_POS_CONVERGED), y)