Adding error for when overlayfs is enabled in OTA

when running adb remount, overlayfs is enabled on the device interfering
with OTA being able to run. Currently we don't have a good debug message
and users aren't able to realize why the OTA fails. Adding this log will
make it clear this behavior is intended, and we need verity-enabled for
OTA to work

Test: adb remount, update_device.py
Bug: 286889613
Change-Id: Ibcd27911afe6f02ddf0c38ad40904a7e17735b31
diff --git a/common/dynamic_partition_control_interface.h b/common/dynamic_partition_control_interface.h
index 490892e..5c0a03b 100644
--- a/common/dynamic_partition_control_interface.h
+++ b/common/dynamic_partition_control_interface.h
@@ -106,7 +106,8 @@
                                           uint32_t target_slot,
                                           const DeltaArchiveManifest& manifest,
                                           bool update,
-                                          uint64_t* required_size) = 0;
+                                          uint64_t* required_size,
+                                          ErrorCode* error = nullptr) = 0;
 
   // After writing to new partitions, before rebooting into the new slot, call
   // this function to indicate writes to new partitions are done.