Specify exactly right size for 7.3 GiB eMMC.

Change-Id: I32b72d56cca3079d454cce5373df7979883aaacc
diff --git a/partition-table.json b/partition-table.json
index a39a449..266beaf 100644
--- a/partition-table.json
+++ b/partition-table.json
@@ -1,6 +1,6 @@
 {
   "settings": {
-    "disk_size": "7 GiB",
+    "disk_size": "7818182656",
     "disk_alignment": "8 MiB",
     "disk_guid": "85b83f23-51c4-4403-8bac-906ff5800f4e"
   },