Switch Gallery to Gallery2 app for emulator images

Change gallery application from Gallery to Gallery2. Gallery does not
seem to have been changed in a long time and AOSP images for devices use
Gallery2 so emulator images should match that.

BUG: 29334386
Change-Id: I1054af38aa1c100cdb671688e2d7aaaf882753af
(cherry picked from commit ea9467cd003f51e83e497b6fbd1a4abd9705be29)
diff --git a/target/product/sdk_base.mk b/target/product/sdk_base.mk
index 13e9124..89a6568 100644
--- a/target/product/sdk_base.mk
+++ b/target/product/sdk_base.mk
@@ -24,7 +24,7 @@
 	Dialer \
 	EmulatorSmokeTests \
 	Fallback \
-	Gallery \
+	Gallery2 \
 	GestureBuilder \
 	Launcher3 \
 	LegacyCamera \