Add IsDynamicPartition API to easily check if a partition is dynamic

Test: treehugger
Change-Id: I655e4d6114a25c58857679985cd5e08581c0faab
diff --git a/common/dynamic_partition_control_interface.h b/common/dynamic_partition_control_interface.h
index a2ebfc6..1362c19 100644
--- a/common/dynamic_partition_control_interface.h
+++ b/common/dynamic_partition_control_interface.h
@@ -159,6 +159,8 @@
       const std::optional<std::string>&,
       bool is_append = false) = 0;
 
+  virtual bool IsDynamicPartition(const std::string& part_name) = 0;
+
   // Create virtual block devices for all partitions.
   virtual bool MapAllPartitions() = 0;
   // Unmap virtual block devices for all partitions.