Put en_US as first product locale for SDK builds.

Change-Id: I7b6dfa066aca75ba8d315bddf2492f81311a7761
diff --git a/target/product/sdk.mk b/target/product/sdk.mk
index 7c281b3..f0142fa 100644
--- a/target/product/sdk.mk
+++ b/target/product/sdk.mk
@@ -153,11 +153,11 @@
 # locale + densities. en_US is both first and in alphabetical order to
 # ensure this is the default locale.
 PRODUCT_LOCALES = \
+	en_US \
 	ldpi \
 	hdpi \
 	mdpi \
 	xhdpi \
-	en_US \
 	ar_EG \
 	ar_IL \
 	bg_BG \