ARM64: zynq: Fix boot.bin generation for Zynq and ZynqMP

Fix boot.bin generation for Zynq and ZynqMP.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Acked-by: NMarek Vasut <marex@denx.de>

scripts/Makefile.spl

@@ -158,11 +158,8 @@ ifeq ($(CONFIG_SYS_SOC),"at91")
 ALL-y	+= boot.bin
 endif
 
-ifdef CONFIG_ARCH_ZYNQ
-ALL-y	+= $(obj)/boot.bin
-endif
-
-ALL-(CONFIG_ARCH_ZYNQMP)	+= $(obj)/boot.bin
+ALL-$(CONFIG_ARCH_ZYNQ)		+= $(obj)/boot.bin
+ALL-$(CONFIG_ARCH_ZYNQMP)	+= $(obj)/boot.bin
 
 all:	$(ALL-y)