PHAL: Helper function to set PDATA_INFODB

systemd runntime global cofiguration keeps a copy of all
the varibles in the application space. Since the PDATA_INFODB
config variable is consumed by limited applications, removed
systemd global settings related to PDATA_INFODB environment.
So application level environment setting required. Added this
helper function to set PDATA_INFODB environment variable for
the attributes tool.

Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
Change-Id: I3e689c0c0d03ec11201e5ee50240409a53e42aad
diff --git a/extensions/phal/pdbg_utils.hpp b/extensions/phal/pdbg_utils.hpp
index 3c1ef32..926d956 100644
--- a/extensions/phal/pdbg_utils.hpp
+++ b/extensions/phal/pdbg_utils.hpp
@@ -64,5 +64,12 @@
  */
 void setDevtreeEnv();
 
+/**
+ * @brief Helper function to set PDATA_INFODB
+ *
+ * PDATA_INFODB environment variable set to pdata attributes infodb path
+ */
+void setPdataInfoDBEnv();
+
 } // namespace phal
 } // namespace openpower