Ensure /radio directory exists in recovery

This directory is needed for nakasig radio OTAs to be successfully
applied.

Bug: 18281224
Change-Id: I9319c3105c5d5aad5c6e21d5c60cf83043a25a1f
diff --git a/device.mk b/device.mk
index e621466..e0ea339 100644
--- a/device.mk
+++ b/device.mk
@@ -21,6 +21,7 @@
 
 PRODUCT_COPY_FILES := \
     device/asus/tilapia/fstab.grouper:root/fstab.grouper \
+    device/asus/tilapia/init.recovery.tilapia.rc:root/init.recovery.grouper.rc \
     device/asus/tilapia/init.tilapia.rc:root/init.grouper.rc
 
 DEVICE_PACKAGE_OVERLAYS := \
diff --git a/init.recovery.tilapia.rc b/init.recovery.tilapia.rc
new file mode 100644
index 0000000..57c704b
--- /dev/null
+++ b/init.recovery.tilapia.rc
@@ -0,0 +1,2 @@
+on init
+    mkdir /radio 0700 root root