Added .NOTPARALLEL special key for *.s intermediate files from *.S

Change-Id: I40c2c0bb1eecc7099bde468e7ee77f94116679ae
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77438
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: MURULIDHAR NATARAJU <murulidhar@in.ibm.com>
Reviewed-by: RAJA DAS <rajadas2@in.ibm.com>

src/build/img_defs.mk

@@ -549,6 +549,8 @@ $(OBJDIR)/%.o: %.c
 $(OBJDIR)/%.s: %.S
 	$(C2) "    ASM        $(notdir $<)"
 	$(C1)$(TCPP) $(PPE-CFLAGS) $(DEFS) $(CPPFLAGS) -o $@ $<
+.NOTPARALLEL: $(OBJDIR)/%.s
+.INTERMEDIATE: $(OBJDIR)/%.s
 .PRECIOUS: $(OBJDIR)/%.s
 
 ifndef P2P_ENABLE