emulator: create qemu images for system,vendor

For raw system.img and vendor.img do not have
partition table and init refuses to mount them
in first stage mounting.

For emulator build:
create partitioned system-qemu.img for system.img;
create partitioned vendor-qemu.img for vendor.img
if applicable.

Change-Id: I64fdcdafc303cf2f74a1e96653e7afe259f0af98
diff --git a/core/tasks/sdk-addon.mk b/core/tasks/sdk-addon.mk
index 610e0ce..e3bd47d 100644
--- a/core/tasks/sdk-addon.mk
+++ b/core/tasks/sdk-addon.mk
@@ -63,7 +63,7 @@
 
 # Files copied in the system-image directory
 files_to_copy += \
-	$(addon_dir_img):$(BUILT_SYSTEMIMAGE):images/$(TARGET_CPU_ABI)/system.img \
+	$(addon_dir_img):$(INSTALLED_QEMU_SYSTEMIMAGE):images/$(TARGET_CPU_ABI)/system.img \
 	$(addon_dir_img):$(BUILT_USERDATAIMAGE_TARGET):images/$(TARGET_CPU_ABI)/userdata.img \
 	$(addon_dir_img):$(BUILT_RAMDISK_TARGET):images/$(TARGET_CPU_ABI)/ramdisk.img \
 	$(addon_dir_img):$(PRODUCT_OUT)/system/build.prop:images/$(TARGET_CPU_ABI)/build.prop \