zynqmp: Enable U-Boot run in EL3

Enable Secure IOU setup to enable U-Boot to run in EL3 without
setting from ATF.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/cpu/armv8/zynqmp/Kconfig

@@ -20,4 +20,8 @@ config SYS_SOC
 config SYS_CONFIG_NAME
 	default "xilinx_zynqmp_ep" if TARGET_ZYNQMP_EP
 
+config SECURE_IOU
+	bool "Configure ZynqMP secure IOU"
+	default n
+
 endif

arch/arm/include/asm/arch-zynqmp/hardware.h

@@ -44,7 +44,11 @@ struct crlapb_regs {
 
 #define crlapb_base ((struct crlapb_regs *)ZYNQMP_CRL_APB_BASEADDR)
 
+#if defined(CONFIG_SECURE_IOU)
+#define ZYNQMP_IOU_SCNTR	0xFF260000
+#else
 #define ZYNQMP_IOU_SCNTR	0xFF250000
+#endif
 #define ZYNQMP_IOU_SCNTR_COUNTER_CONTROL_REGISTER_EN	0x1
 #define ZYNQMP_IOU_SCNTR_COUNTER_CONTROL_REGISTER_HDBG	0x2