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/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 2cb5dae..3b518c2 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -21,7 +21,7 @@
 	select SYS_FSL_DDR
 	select SYS_FSL_DDR_BE
 	select SYS_FSL_IFC_BE
-	select BINMAN if OF_SEPARATE
+	select BINMAN if MPC85XX_HAVE_RESET_VECTOR && OF_SEPARATE
 	imply CMD_HASH
 	imply CMD_IRQ
 	imply USB_EHCI_HCD if USB