phal: Added extensions/phal folder

Added phal specific folder to keep all phal feature
based function in common place

Moved phal error specific source files to  extensions/phal

Tested: build verified.

Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
Change-Id: Iabae2689444f355008802950a293e7c69cb19553
diff --git a/procedures/phal/proc_pre_poweroff.cpp b/procedures/phal/proc_pre_poweroff.cpp
index 3997b19..658b446 100644
--- a/procedures/phal/proc_pre_poweroff.cpp
+++ b/procedures/phal/proc_pre_poweroff.cpp
@@ -1,4 +1,4 @@
-#include "phalerror/phal_error.hpp"
+#include "extensions/phal/phal_error.hpp"
 #include "procedures/phal/common_utils.hpp"
 #include "registration.hpp"