powerpc: mpc85xx: Fix CONFIG_OF_EMBED support for NOR booting

mpc85xx NOR binary contains also reset vector and therefore option
CONFIG_MPC85XX_HAVE_RESET_VECTOR must be defined.

When build system uses binman, it takes care of constructing final image
which consist of u-boot-without-reset-vector, DTB and reset-vector.

CONFIG_OF_EMBED does not use binman, there is no external DTB and Makefile
produce directly final u-boot.bin binary.

So in this case mpc85xx reset vector must not be stripped from the final
u-boot.bin binary. Fix it.
Signed-off-by: NPali Rohár <pali@kernel.org>

Makefile

@@ -1263,7 +1263,7 @@ spl/u-boot-spl.srec: spl/u-boot-spl FORCE
 
 OBJCOPYFLAGS_u-boot-nodtb.bin := -O binary \
 		$(if $(CONFIG_X86_16BIT_INIT),-R .start16 -R .resetvec) \
-		$(if $(CONFIG_MPC85XX_HAVE_RESET_VECTOR),-R .bootpg -R .resetvec)
+		$(if $(CONFIG_MPC85XX_HAVE_RESET_VECTOR),$(if $(CONFIG_OF_EMBED),,-R .bootpg -R .resetvec))
 
 binary_size_check: u-boot-nodtb.bin FORCE
 	@file_size=$(shell wc -c u-boot-nodtb.bin | awk '{print $$1}') ; \