mediatek: wlan: move dhcpcd config, fix non-sprout build

* Move dhcpcd.conf to new wlan/config subdirectory.
* Only include wlan/ makefiles for boards with MediaTek wireless.

Change-Id: Ia4f65d2f1683cb21745997c3423ff22ec018f047
diff --git a/wlan/Android.mk b/wlan/Android.mk
new file mode 100644
index 0000000..7990a63
--- /dev/null
+++ b/wlan/Android.mk
@@ -0,0 +1,3 @@
+ifeq ($(BOARD_WLAN_DEVICE),MediaTek)
+    include $(call all-subdir-makefiles)
+endif
diff --git a/android_dhcpcd/Android.mk b/wlan/config/Android.mk
similarity index 100%
rename from android_dhcpcd/Android.mk
rename to wlan/config/Android.mk
diff --git a/android_dhcpcd/android_dhcpcd.conf b/wlan/config/android_dhcpcd.conf
similarity index 100%
rename from android_dhcpcd/android_dhcpcd.conf
rename to wlan/config/android_dhcpcd.conf