vbox_x86: use cache.img

Change-Id: I3498af8258adbb88ccd26c3c101842567cc28364
Signed-off-by: Iliyan Malchev <malchev@google.com>
diff --git a/android_img_data_layout.conf b/android_img_data_layout.conf
index a02d374..9ddbabc 100644
--- a/android_img_data_layout.conf
+++ b/android_img_data_layout.conf
@@ -49,10 +49,8 @@
         }
 
         # /dev/sdX7
-        cache {
+        inst_cache {
             type linux
-            len 8064
         }
-
     }
 }
diff --git a/config.mk b/config.mk
index 0f72542..484271c 100644
--- a/config.mk
+++ b/config.mk
@@ -227,7 +227,8 @@
 	@rm -f $@
 	$(hide) cat $(grub_bin) > $@
 	$(hide) $(edit_mbr) -l $(android_data_layout) -i $@ \
-		inst_data=$(INSTALLED_USERDATAIMAGE_TARGET)
+		inst_data=$(INSTALLED_USERDATAIMAGE_TARGET) \
+		inst_cache=$(INSTALLED_CACHEIMAGE_TARGET)
 	@echo "Done with bootable android data-disk image -[ $@ ]-"