qcacld-3.0: Support the Bazel DDK

Android builds are transitioning to using Bazel for builds, and there
is a Driver Development Kit (DDK) which out-of-tree drivers must use
in this new scheme. Introduce the infrastructure to describe the wlan
qcacld-3.0 driver module using the DDK.

Change-Id: Ice293fe10f37a0d083187edd49f352e3a4dca18a
CRs-Fixed: 3494233

BUILD.bazel

@@ -0,0 +1,10 @@
+load("//build/kernel/kleaf:kernel.bzl", "ddk_headers")
+load(":wlan_qcacld3_modules.bzl", "define_modules")
+
+package(
+    default_visibility = [
+        "//visibility:public",
+    ],
+)
+
+define_modules()