Refine libfdt_clean target

Move it to the libfdt Makefile piece, use neater make syntax, and remove
redundant command (already included in STD_CLEANFILES).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Makefile

@@ -197,11 +197,6 @@ libfdt: $(LIBFDT_archive) $(LIBFDT_lib)
 $(LIBFDT_archive): $(addprefix $(LIBFDT_objdir)/,$(LIBFDT_OBJS))
 $(LIBFDT_lib): $(addprefix $(LIBFDT_objdir)/,$(LIBFDT_OBJS))
 
-libfdt_clean:
-	@$(VECHO) CLEAN "(libfdt)"
-	rm -f $(addprefix $(LIBFDT_objdir)/,$(STD_CLEANFILES))
-	rm -f $(LIBFDT_objdir)/*.so
-
 ifneq ($(DEPTARGETS),)
 -include $(LIBFDT_OBJS:%.o=$(LIBFDT_objdir)/%.d)
 endif

libfdt/Makefile.libfdt

@@ -9,3 +9,7 @@ LIBFDT_VERSION = version.lds
 LIBFDT_SRCS = fdt.c fdt_ro.c fdt_wip.c fdt_sw.c fdt_rw.c fdt_strerror.c fdt_empty_tree.c \
 	fdt_addresses.c fdt_overlay.c
 LIBFDT_OBJS = $(LIBFDT_SRCS:%.c=%.o)
+
+libfdt_clean:
+	@$(VECHO) CLEAN "(libfdt)"
+	rm -f $(STD_CLEANFILES:%=$(LIBFDT_objdir)/%)