liblp: Remove the guid field from LpMetadataPartition.

Bug: 117229984
Test: liblp_test gtest
Change-Id: Ie42b3a8005b1cf711303966a2a117c255f0fb08c
diff --git a/fastboot/device/flashing.cpp b/fastboot/device/flashing.cpp
index a383c54..4fc3d1d 100644
--- a/fastboot/device/flashing.cpp
+++ b/fastboot/device/flashing.cpp
@@ -146,8 +146,7 @@
         if (builder->FindPartition(name)) {
             continue;
         }
-        std::string guid = GetPartitionGuid(partition);
-        if (!builder->AddPartition(name, guid, partition.attributes)) {
+        if (!builder->AddPartition(name, partition.attributes)) {
             return device->WriteFail("Unable to add partition: " + name);
         }
     }