Drop unnecessary partition-table package from manifest.

Change-Id: Ib3ddc8299b00b19e25f14e91bb7238f976dbb004
diff --git a/excelsior.xml b/excelsior.xml
index cbe4c74..dc92c52 100644
--- a/excelsior.xml
+++ b/excelsior.xml
@@ -55,8 +55,6 @@
       name="excelsior-mendel/packages/trustzone" />
     <project remote="excelsior" path="packages/linux-mtk"
       name="excelsior-mendel/packages/linux-mtk" />
-    <project remote="excelsior" path="packages/partition-table"
-      name="excelsior-mendel/packages/partition-table" />
     <project remote="excelsior" path="packages/boot-keys"
       name="excelsior-mendel/packages/boot-keys" />
     <!-- END mtk packages repos -->