device-common: Do not strip signed GKI modules

Do not strip signed GKI modules while installing them in
vendor_ramdisk. Otherwise we run into the following fatal
error while loading signed GKI modules:

"module verification failed: signature and/or required key missing - tainting kernel"

Ideally signed GKI modules should go in a separate
system_dlkm partition, but we don't have that part supported
on dragonboards yet. So this is a temporary hack while a
proper fix is being worked upon.

Change-Id: Id7ce6b5fe073d224510c2622b4d6dda041bde7c2
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
diff --git a/device-common.mk b/device-common.mk
index 5ee218a..d2d2036 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -21,6 +21,7 @@
 ifeq ($(TARGET_USES_GKI), true)
   TARGET_MODS := $(wildcard $(TARGET_KERNEL_DIR)/*.ko)
   ifneq ($(TARGET_MODS),)
+    BOARD_DO_NOT_STRIP_VENDOR_RAMDISK_MODULES := true
     BOARD_VENDOR_RAMDISK_KERNEL_MODULES := $(TARGET_MODS)
   endif
 endif