libhardware: make radio vendor only

Limit AOSP usage of historical HAL implementation interface to
avoid mistakes.

Bug: 37280010
Test: build
Change-Id: I677fb072beb8399a868690ef2a4da4f9c131cf1a
diff --git a/include/hardware/radio.h b/include/hardware/radio.h
deleted file mode 120000
index f9ad9d7..0000000
--- a/include/hardware/radio.h
+++ /dev/null
@@ -1 +0,0 @@
-../../include_all/hardware/radio.h
\ No newline at end of file
diff --git a/include_all/hardware/radio.h b/include_vendor/hardware/radio.h
similarity index 100%
rename from include_all/hardware/radio.h
rename to include_vendor/hardware/radio.h