phal: move common_utils.cpp to extensions/phal

tested: verified build

Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
Change-Id: Ib34b0ed54010cf9e4cc2d56bfaccdf23db28b11f
diff --git a/meson.build b/meson.build
index 803a6fd..891b6b2 100644
--- a/meson.build
+++ b/meson.build
@@ -65,7 +65,7 @@
         'procedures/phal/start_host.cpp',
         'procedures/phal/set_SPI_mux.cpp',
         'procedures/phal/proc_pre_poweroff.cpp',
-        'procedures/phal/common_utils.cpp',
+        'extensions/phal/common_utils.cpp',
         'procedures/phal/check_host_running.cpp',
         'extensions/phal/create_pel.cpp',
         'extensions/phal/phal_error.cpp',