ARM: zynq: rename CONFIG_ZYNQ to CONFIG_ARCH_ZYNQ

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index 26e570e..1046ece 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -1,4 +1,4 @@
-if ZYNQ
+if ARCH_ZYNQ
 
 choice
 	prompt "Xilinx Zynq board select"