Fix boot_profile_jars.zip

soong_zip was previously ignoring trailing command line arguments,
but now they are an error.  boot_profile_jars.zip had all its
files as trailing arguments instead of as -f flags, previously
resulting in an empty zip, but now causing an error.  Fix the
arguments to use -f before each file.

Test: m PRODUCT_DIST_BOOT_AND_SYSTEM_JARS=true out/target/product/sailfish/boot_profile_jars.zip
Change-Id: I8ac4aa4fbca812b8aa2ff9526e1ed7c769dd8420
diff --git a/core/dex_preopt.mk b/core/dex_preopt.mk
index aa24c20..1527047 100644
--- a/core/dex_preopt.mk
+++ b/core/dex_preopt.mk
@@ -159,7 +159,7 @@
 $(boot_profile_jars_zip): $(all_boot_jars) $(SOONG_ZIP)
 	echo "Create boot profiles package: $@"
 	rm -f $@
-	$(SOONG_ZIP) -o $@ -C $(PRODUCT_OUT) $(PRIVATE_JARS)
+	$(SOONG_ZIP) -o $@ -C $(PRODUCT_OUT) $(addprefix -f ,$(PRIVATE_JARS))
 
 droidcore: $(boot_profile_jars_zip)