pw_status: Replace Status::Ok() with OkStatus()

- Mark Status::Ok() and StatusWithSize::Ok() as deprecated.
- Replace Status::Ok() with OkStatus().
- Replace StatusWithSize::Ok() with StatusWithSize().

Change-Id: If7192282446bf6d7f90990bb0b4f1b1b89a9228a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/29003
Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Keir Mierle <keir@google.com>
diff --git a/pw_kvs/flash_partition_with_stats.cc b/pw_kvs/flash_partition_with_stats.cc
index 6b2431b..26b0eee 100644
--- a/pw_kvs/flash_partition_with_stats.cc
+++ b/pw_kvs/flash_partition_with_stats.cc
@@ -29,7 +29,7 @@
                                                  const char* label) {
   // If size is zero saving stats is disabled so do not save any stats.
   if (sector_counters_.size() == 0) {
-    return Status::Ok();
+    return OkStatus();
   }
 
   KeyValueStore::StorageStats stats = kvs.GetStorageStats();
@@ -67,7 +67,7 @@
 
   std::fprintf(out_file, "\n");
   std::fclose(out_file);
-  return Status::Ok();
+  return OkStatus();
 }
 
 Status FlashPartitionWithStats::Erase(Address address, size_t num_sectors) {