arm64: versal: Move IOU_SWITCH_DIVISOR0 to Kconfig

Move hardcoded IOU_SWITCH_DIVISOR0 to Kconfig to be able to set it up
for different platforms.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/mach-versal/Kconfig b/arch/arm/mach-versal/Kconfig
index f291800..26d1756 100644
--- a/arch/arm/mach-versal/Kconfig
+++ b/arch/arm/mach-versal/Kconfig
@@ -41,6 +41,12 @@
 	default 0x1000
 	depends on OF_BOARD
 
+config IOU_SWITCH_DIVISOR0
+	hex "IOU switch divisor0"
+	default 0x20
+	help
+	  Setup time clock divisor for input clock.
+
 config SYS_MEM_RSVD_FOR_MMU
 	bool "Reserve memory for MMU Table"
 	help