Revert "Remove kPrefsDynamicPartitionMetadataInitialized."

This reverts commit 09f6e0f8f5340e2e8f6bf14e08adf25798eab360.

Reason for revert: Should not re-initialize metadata when resuming
from an update.

Bug: 120465293
Bug: 120775936
Test: manual OTA, interrupt and resume
Change-Id: Ib1626dfa4a766e9a5ffaf2d9d74ec2b04c76052d
diff --git a/common/constants.cc b/common/constants.cc
index 4bca105..3ae7a60 100644
--- a/common/constants.cc
+++ b/common/constants.cc
@@ -37,6 +37,8 @@
 const char kPrefsDailyMetricsLastReportedAt[] =
     "daily-metrics-last-reported-at";
 const char kPrefsDeltaUpdateFailures[] = "delta-update-failures";
+const char kPrefsDynamicPartitionMetadataInitialized[] =
+    "dynamic-partition-metadata-initialized";
 const char kPrefsFullPayloadAttemptNumber[] = "full-payload-attempt-number";
 const char kPrefsInstallDateDays[] = "install-date-days";
 const char kPrefsLastActivePingDay[] = "last-active-ping-day";