powerpc/boot: add zImage.lds to targets

This prevents spurious rebuilds of the lds and then wrappers.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210611111104.1058991-1-npiggin@gmail.com

arch/powerpc/boot/Makefile

@@ -227,7 +227,7 @@ $(obj)/wrapper.a: $(obj-wlib) FORCE
 
 hostprogs	:= addnote hack-coff mktree
 
-targets		+= $(patsubst $(obj)/%,%,$(obj-boot) wrapper.a)
+targets		+= $(patsubst $(obj)/%,%,$(obj-boot) wrapper.a) zImage.lds
 extra-y		:= $(obj)/wrapper.a $(obj-plat) $(obj)/empty.o \
 		   $(obj)/zImage.lds $(obj)/zImage.coff.lds $(obj)/zImage.ps3.lds