PPC: split xen-syms linking rule

Doing so, besides (hopefully) adding clarity (not the least by way of
[re-]using pattern rules where possible), also avoids explicit recursive
$(MAKE) invocations.

By re-using the generic rules introduced when the respective x86 rule was
split,
- the .map file now isn't created after the final binary anymore,
- --strip-debug is passed to $(LD) during early linking passes (for
  consistency the option is also explicitly added to the optional linking
  pass rule),
- CONFIG_{SUPPRESS_DUPLICATE_SYMBOL_WARNINGS,ENFORCE_UNIQUE_SYMBOLS} are
  now properly respected.
Orphan section checking, otoh, is getting suppressed for now, until the
about a dozen warnings which would result have been taken care of.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Anthony PERARD <anthony.perard@vates.tech>

xen/arch/ppc/Makefile

@@ -11,28 +11,12 @@ obj-y += tlb-radix.o
 $(TARGET): $(TARGET)-syms
 	cp -f $< $@
 
-$(TARGET)-syms: $(objtree)/prelink.o $(obj)/xen.lds
-	$(objtree)/tools/symbols $(all_symbols) --empty > $(dot-target).0.S
-	$(MAKE) $(build)=$(@D) $(dot-target).0.o
-	$(LD) $(XEN_LDFLAGS) -T $(obj)/xen.lds $< $(build_id_linker) \
-	      $(dot-target).0.o -o $(dot-target).0
-	$(NM) -pa --format=sysv $(dot-target).0 \
-		| $(objtree)/tools/symbols $(all_symbols) --sysv --sort \
-		> $(dot-target).1.S
-	$(MAKE) $(build)=$(@D) $(dot-target).1.o
-	$(LD) $(XEN_LDFLAGS) -T $(obj)/xen.lds $< $(build_id_linker) \
-	    $(dot-target).1.o -o $(dot-target).1
-	$(NM) -pa --format=sysv $(dot-target).1 \
-		| $(objtree)/tools/symbols $(all_symbols) --sysv --sort \
-		> $(dot-target).2.S
-	$(MAKE) $(build)=$(@D) $(dot-target).2.o
-	$(call compare-symbol-tables, $(dot-target).1.o, $(dot-target).2.o)
-	$(LD) $(XEN_LDFLAGS) -T $(obj)/xen.lds $< $(build_id_linker) \
-	    $(dot-target).2.o -o $@
-	$(NM) -pa --format=sysv $@ \
-		| $(objtree)/tools/symbols --all-symbols --xensyms --sysv --sort \
-		> $@.map
-	rm -f $(dot-target).[0-9]* $(@D)/..$(@F).[0-9]*
+LAST_LINKING_PASS := 2
+
+include scripts/Makefile.link
+
+# Suppress orphan section checking for the time being.
+orphan-handling-y :=
 
 $(obj)/xen.lds: $(src)/xen.lds.S FORCE
 	$(call if_changed_dep,cpp_lds_S)