thermalserviced: add ThermalService daemon

Add ThermalService daemon to embedded.mk as part of the minimal build
of open source parts of the tree.

Test: manual on marlin
Bug: 30982366
Change-Id: I8315a8f5871ec24d8970deaa8527ee74db1c4dc7
(cherry picked from commit d006688090e7ef31985dd728c2b92e4951371d57)
diff --git a/target/product/embedded.mk b/target/product/embedded.mk
index 22c6112..aefba43 100644
--- a/target/product/embedded.mk
+++ b/target/product/embedded.mk
@@ -76,6 +76,7 @@
     shell_and_utilities \
     storaged \
     surfaceflinger \
+    thermalserviced \
     tombstoned \
     tzdatacheck \
     vndservice \