libhardware: make thermal vendor only

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

Bug: 37280010
Test: build
Change-Id: I2a3db8ea03103e59ebfc84feaed6c527b8ad0e1e
diff --git a/include/hardware/thermal.h b/include/hardware/thermal.h
deleted file mode 120000
index d6b5270..0000000
--- a/include/hardware/thermal.h
+++ /dev/null
@@ -1 +0,0 @@
-../../include_all/hardware/thermal.h
\ No newline at end of file
diff --git a/include_all/hardware/thermal.h b/include_vendor/hardware/thermal.h
similarity index 100%
rename from include_all/hardware/thermal.h
rename to include_vendor/hardware/thermal.h