Add install op types for lz4diff

Added two types, but both types will be handled by the same patching
function. Two types were added instead of one because this way ota
analyzer can show us a break down between BSDIFF and PUFFDIFF.

Test: th
Bug: 206729162

Change-Id: I8aa28516c0e2ebae73190102d2f4d36e94a35d42
diff --git a/update_metadata.proto b/update_metadata.proto
index 6164a4d..d318a62 100644
--- a/update_metadata.proto
+++ b/update_metadata.proto
@@ -190,6 +190,10 @@
 
     // On minor version 8 or newer, these operations are supported:
     ZUCCHINI = 11;
+
+    // On minor version 9 or newer, these operations are supported:
+    LZ4DIFF_BSDIFF = 12;
+    LZ4DIFF_PUFFDIFF = 13;
   }
   required Type type = 1;