Fix symsmode check to allow in-memory lookup

Switched the default value from empty string to 'default' and
fix the associated checks.

Change-Id: If8379ad02854fd46b800e5dbfdfef41558ee745e
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/63154
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: William G. Hoffa <wghoffa@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/build/debug/Hostboot/_DebugFramework.pm

@@ -502,12 +502,13 @@ sub findPointer
     my $size;
 
     my $symsmode = ::getSymsMode();
-    if( ($symsmode =~ "") || ($symsmode =~ "usemem") )
+
+    if( ($symsmode =~ "default") || ($symsmode =~ "usemem") )
     {
         ($addr, $size ) = findDebugPointer( $dbgptrstr );
     }
 
-    if( (($symsmode =~ "") && (not defined $addr))
+    if( (($symsmode =~ "default") && (not defined $addr))
         || ($symsmode =~ "usefile") )
     {
         #::userDisplay( "*Using Symbol File*\n" );

src/build/debug/ecmd-debug-framework.pl

@@ -70,7 +70,7 @@
 #   "" : Default - Try to use memory, fall-back to symbol files
 #   "usefile" : Only use the symbol files
 #   "usemem" : Only use the data from memory
-my $useSymsMode = "";
+my $useSymsMode = "default";
 
 GetOptions("tool:s" => \$tool,
            "tool-options:s" => \$toolOptions,