releasetools: add compatibility for full ota functions with incrementals

Some device-specific releasetool functions may expect that input_zip
and input_version are set. For incremental OTAs, target_zip and
target_version are set instead.

Set input_zip=target_zip and input_version=target_version to add
compatibility with these functions.

Change-Id: I6a04f67440618d3652396656cc1fe223d4a6b195
diff --git a/tools/releasetools/ota_from_target_files b/tools/releasetools/ota_from_target_files
index 547122f..68001ec 100755
--- a/tools/releasetools/ota_from_target_files
+++ b/tools/releasetools/ota_from_target_files
@@ -788,7 +788,9 @@
       source_zip=source_zip,
       source_version=source_version,
       target_zip=target_zip,
+      input_zip=target_zip,
       target_version=target_version,
+      input_version=target_version,
       output_zip=output_zip,
       script=script,
       metadata=metadata,
@@ -1156,7 +1158,9 @@
       source_zip=source_zip,
       source_version=source_version,
       target_zip=target_zip,
+      input_zip=target_zip,
       target_version=target_version,
+      input_version=target_version,
       output_zip=output_zip,
       script=script,
       metadata=metadata,