Revert "Sign APKs using SHA-256 instead of SHA-1 when possible." This is breaking CTS.

This reverts commit c2a36afd6772d9286e8071693f80648beef763a3.

Change-Id: I4389bf99aeb213198c1c501ba9462bd4a4540d0a
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index 225082b..601a79c 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -213,7 +213,7 @@
 endif
 $(built_module): PRIVATE_EMBEDDED_JNI_LIBS := $(embedded_prebuilt_jni_libs)
 
-$(built_module) : $(my_prebuilt_src_file) | $(ACP) $(ZIPALIGN) $(SIGNAPK_JAR) $(AAPT)
+$(built_module) : $(my_prebuilt_src_file) | $(ACP) $(ZIPALIGN) $(SIGNAPK_JAR)
 	$(transform-prebuilt-to-target)
 	$(uncompress-shared-libs)
 ifneq ($(LOCAL_CERTIFICATE),PRESIGNED)
@@ -252,7 +252,7 @@
 
 $(built_apk_splits) : PRIVATE_PRIVATE_KEY := $(LOCAL_CERTIFICATE).pk8
 $(built_apk_splits) : PRIVATE_CERTIFICATE := $(LOCAL_CERTIFICATE).x509.pem
-$(built_apk_splits) : $(built_module_path)/%.apk : $(my_src_dir)/%.apk | $(ACP) $(AAPT)
+$(built_apk_splits) : $(built_module_path)/%.apk : $(my_src_dir)/%.apk | $(ACP)
 	$(copy-file-to-new-target)
 	$(sign-package)