cnss2: Protect dependency on sec-module-symvers for KBUILD_EXTRA_SYMBOLS

Protect dependency on sec-module-symvers under flag
TARGET_KERNEL_DLKM_SECURE_MSM_OVERRIDE so that platform driver
builds successfully if TARGET_KERNEL_DLKM_SECURE_MSM_OVERRIDE
is set to false.

Change-Id: Ib357815f73cd3b7e94854fa070ec036bb8624976
CRs-Fixed: 3433493

Android.mk

@@ -31,7 +31,9 @@ CNSS_SRC_FILES := \
 	$(wildcard $(LOCAL_PATH)/*) \
 	$(wildcard $(LOCAL_PATH)/*/*) \
 
+ifeq ($(TARGET_KERNEL_DLKM_SECURE_MSM_OVERRIDE), true)
 KBUILD_OPTIONS += KBUILD_EXTRA_SYMBOLS=$(PWD)/$(call intermediates-dir-for,DLKM,sec-module-symvers)/Module.symvers
+endif
 
 # Module.symvers needs to be generated as a intermediate module so that
 # other modules which depend on WLAN platform modules can set local