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.h b/common/constants.h
index 1057a65..61e5ddd 100644
--- a/common/constants.h
+++ b/common/constants.h
@@ -41,6 +41,7 @@
 extern const char kPrefsCurrentUrlIndex[];
 extern const char kPrefsDailyMetricsLastReportedAt[];
 extern const char kPrefsDeltaUpdateFailures[];
+extern const char kPrefsDynamicPartitionMetadataInitialized[];
 extern const char kPrefsFullPayloadAttemptNumber[];
 extern const char kPrefsInstallDateDays[];
 extern const char kPrefsLastActivePingDay[];