Reduce the propagation of LOCAL_DEX_PREOPT := nostripping

nostripping causes confusing double negatives, allow nostripping
in LOCAL_DEX_PREOPT and DEFAULT_DEX_PREOPT, but convert to
LOCAL_STRIP_DEX outside of dex_preopt_odex_install.mk.

Test: m checkbuild
Change-Id: I996e9258ce20c394900d9fe937d638bc2ab8589d
diff --git a/core/soong_java_prebuilt.mk b/core/soong_java_prebuilt.mk
index 20bfc66..288a763 100644
--- a/core/soong_java_prebuilt.mk
+++ b/core/soong_java_prebuilt.mk
@@ -108,7 +108,7 @@
 	@echo "Dexpreopt Jar: $(PRIVATE_MODULE) ($@)"
 	$(call dexpreopt-one-file,$<,$@)
 
-         $(eval $(call dexpreopt-copy-jar,$(common_javalib.jar),$(LOCAL_BUILT_MODULE),$(LOCAL_DEX_PREOPT)))
+         $(eval $(call dexpreopt-copy-jar,$(common_javalib.jar),$(LOCAL_BUILT_MODULE),$(LOCAL_STRIP_DEX)))
         endif # ! boot jar
       else # LOCAL_DEX_PREOPT
         $(eval $(call copy-one-file,$(common_javalib.jar),$(LOCAL_BUILT_MODULE)))