kernel: allow installing modules to vendor overlay

Change-Id: Ie73386888f47346576b2a814dff9f53dbe1e07bd
diff --git a/build/tasks/kernel.mk b/build/tasks/kernel.mk
index c0e0c4d..57eb0bd 100644
--- a/build/tasks/kernel.mk
+++ b/build/tasks/kernel.mk
@@ -53,6 +53,8 @@
 #                                          modules in root instead of vendor
 #   NEED_KERNEL_MODULE_SYSTEM          = Optional, if true, install kernel
 #                                          modules in system instead of vendor
+#   NEED_KERNEL_MODULE_VENDOR_OVERLAY  = Optional, if true, install kernel
+#                                          modules in vendor overlay instead of vendor
 
 ifneq ($(TARGET_NO_KERNEL),true)
 
@@ -156,6 +158,10 @@
 KERNEL_MODULES_OUT := $(TARGET_OUT)
 KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_system)
 KERNEL_MODULE_MOUNTPOINT := system
+else ifeq ($(NEED_KERNEL_MODULE_VENDOR_OVERLAY),true)
+KERNEL_MODULES_OUT := $(TARGET_OUT_PRODUCT)/vendor_overlay/29
+KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_product)
+KERNEL_MODULE_MOUNTPOINT := product
 else
 KERNEL_MODULES_OUT := $(TARGET_OUT_VENDOR)
 KERNEL_DEPMOD_STAGING_DIR := $(KERNEL_BUILD_OUT_PREFIX)$(call intermediates-dir-for,PACKAGING,depmod_vendor)