Move java install rules into Soong

Remove the copy rules for LOCAL_SOONG_BUILT_INSTALLED, they will already
be created by Soong.

Also clean the soong host tools directory to remove any old copies of
java binaries.

Bug: 204136549
Test: m checkbuild
Change-Id: Ib6b5362ad59aa48770e48541430d6857846926c2
diff --git a/CleanSpec.mk b/CleanSpec.mk
index b8148eb..dd5c476 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -766,6 +766,9 @@
 # More of SOONG_HOST_OUT_EXECUTABLES has been moved to HOST_OUT_EXECUTABLES
 $(call add-clean-step, rm -rf $(SOONG_HOST_OUT))
 
+# More of SOONG_HOST_OUT_EXECUTABLES has been moved to HOST_OUT_EXECUTABLES
+$(call add-clean-step, rm -rf $(SOONG_HOST_OUT))
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************