omni: fix build name clash for OmniStoreInstaller

Change-Id: Ie24af9758077334d64805f79afbbeb17a0f3c2f6
diff --git a/config/packages.mk b/config/packages.mk
index 8b0402d..0b28400 100644
--- a/config/packages.mk
+++ b/config/packages.mk
@@ -21,7 +21,7 @@
     Phonograph
 else
 PRODUCT_PACKAGES += \
-    OmniStoreInstaller
+    OmniStoreInstallerPrebuilt
 endif
 
 # Additional tools