PEL: rename feature flag SBE_FFDC_SUPPORTED

  Initially SBE_FFDC_SUPPORTED flag introduced to enable
SBE ffdc specific feature from phal feature enabled systems.
There is new requirement to add additional callout details
for phal feature enabled systems.
Changing "SBE_FFDC_SUPPORTED" to PHAL feature specific
name "PEL_ENABLE_PHAL".

Tested: verified build with phal enabled option.

Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
Change-Id: Ief4b7a97fa148707f48f70f3f99d2f1a04a05f2e
diff --git a/extensions/openpower-pels/entry_points.cpp b/extensions/openpower-pels/entry_points.cpp
index da3073b..6deef72 100644
--- a/extensions/openpower-pels/entry_points.cpp
+++ b/extensions/openpower-pels/entry_points.cpp
@@ -56,7 +56,7 @@
                                         std::move(logger));
 #endif
 
-#ifdef SBE_FFDC_SUPPORTED
+#ifdef PEL_ENABLE_PHAL
     // PDBG_DTB environment variable set to CEC device tree path
     static constexpr auto PDBG_DTB_PATH =
         "/var/lib/phosphor-software-manager/pnor/rw/DEVTREE";