Makefile: Reduce usage of custom mpc85xx u-boot.bin target

Building of final u-boot.bin binary for mpc85xx via binman is needed only
when inserting DTB binary in the middle of the u-boot ELF binary (before
.bootpg and .resetvec ELF sections).

These requirements are met when CONFIG_MPC85XX_HAVE_RESET_VECTOR is enabled
(= generating .bootpg/.resetvec sections) and CONFIG_OF_SEPARATE is enabled
(= inserting DTB binary).

So in all other cases use standard build procedure instead of custom
mpc85xx u-boot.bin Makefile target via binman.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
diff --git a/Makefile b/Makefile
index b1dc785..11662c5 100644
--- a/Makefile
+++ b/Makefile
@@ -1213,12 +1213,12 @@
 u-boot-dtb.bin: u-boot-nodtb.bin dts/dt.dtb FORCE
 	$(call if_changed,cat)
 
-ifneq ($(CONFIG_MPC85xx)$(CONFIG_OF_SEPARATE),yy)
+ifneq ($(CONFIG_MPC85XX_HAVE_RESET_VECTOR)$(CONFIG_OF_SEPARATE),yy)
 u-boot.bin: u-boot-dtb.bin FORCE
 	$(call if_changed,copy)
 endif
 
-else ifneq ($(CONFIG_MPC85xx)$(CONFIG_OF_SEPARATE),yy)
+else ifneq ($(CONFIG_MPC85XX_HAVE_RESET_VECTOR)$(CONFIG_OF_SEPARATE),yy)
 u-boot.bin: u-boot-nodtb.bin FORCE
 	$(call if_changed,copy)
 endif
@@ -1598,17 +1598,14 @@
 
 endif
 
-ifeq ($(CONFIG_MPC85xx)$(CONFIG_OF_SEPARATE),yy)
-u-boot.bin: u-boot-nodtb.bin u-boot.dtb \
-	$(if $(CONFIG_MPC85XX_HAVE_RESET_VECTOR), u-boot-br.bin) FORCE
+ifeq ($(CONFIG_MPC85XX_HAVE_RESET_VECTOR)$(CONFIG_OF_SEPARATE),yy)
+u-boot.bin: u-boot-nodtb.bin u-boot.dtb u-boot-br.bin FORCE
 	$(call if_changed,binman)
 
-ifeq ($(CONFIG_MPC85XX_HAVE_RESET_VECTOR),y)
 OBJCOPYFLAGS_u-boot-br.bin := -O binary -j .bootpg -j .resetvec
 u-boot-br.bin: u-boot FORCE
 	$(call if_changed,objcopy)
 endif
-endif
 
 quiet_cmd_ldr = LD      $@
 cmd_ldr = $(LD) $(LDFLAGS_$(@F)) \