liblp: Remove the guid field from LpMetadataPartition.

Bug: 117229984
Test: liblp_test gtest
Change-Id: Ie42b3a8005b1cf711303966a2a117c255f0fb08c
diff --git a/fastboot/device/commands.cpp b/fastboot/device/commands.cpp
index b02d968..8d5ba8e 100644
--- a/fastboot/device/commands.cpp
+++ b/fastboot/device/commands.cpp
@@ -353,13 +353,7 @@
         return device->WriteFail("Partition already exists");
     }
 
-    // Make a random UUID, since they're not currently used.
-    uuid_t uuid;
-    char uuid_str[37];
-    uuid_generate_random(uuid);
-    uuid_unparse(uuid, uuid_str);
-
-    Partition* partition = builder->AddPartition(partition_name, uuid_str, 0);
+    Partition* partition = builder->AddPartition(partition_name, 0);
     if (!partition) {
         return device->WriteFail("Failed to add partition");
     }