Fix compile for PRD console error display

  - Actually compile in the strings

Change-Id: I96b1a96e44dfa0b6248f025a9698a9464f324f4b
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/43088
Tested-by: Jenkins Server <pfd-jenkins+hostboot@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>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Prachi Gupta <pragupta@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Reviewed-by: Zane C. Shelley <zshelle@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/usr/errldisplay/makefile

@@ -31,8 +31,9 @@ OBJS += errldisplay.o
 OBJS += errldisplaydata.o
 
 #PRDF Error Sigs
-include ${ROOTPATH}/src/usr/diag/prdf/common/rule/tables.mk
-OBJS += $(if $(CONFIG_CONSOLE_OUTPUT_FFDCDISPLAY),$(prd_rule_disp_targets))
+include ${ROOTPATH}/src/usr/diag/prdf/common/rule/prdf_rule.mk
+prd_rule_disp_targets = ${PRDR_RULE_TABLES:.prf=.prf.disp.o}
+OBJS += $(if $(CONFIG_CONSOLE_OUTPUT_FFDCDISPLAY),${prd_rule_disp_targets})
 
 include ${ROOTPATH}/config.mk