arm64: zynqmp: Changed scratch address used by the alternate memory test

This patch changed CONFIG_SYS_MEMTEST_SCRATCH address to the
accessible DDR address used by alternate memory test.
Before this, 0xfffc0000 address was used, which is the OCM
address and not enabled in MMU table. So, whenever trying
to access 0xfffc0000 address, got Synchronous Abort exception.

After changing CONFIG_SYS_MEMTEST_SCRATCH address, alternate
memory test is working fine.
Signed-off-by: NVipul Kumar <vipulk@xilinx.com>
Signed-off-by: NSiva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

include/configs/xilinx_zynqmp.h

@@ -21,7 +21,9 @@
 #define GICC_BASE	0xF9020000
 
 #define CONFIG_SYS_ALT_MEMTEST
-#define CONFIG_SYS_MEMTEST_SCRATCH	0xfffc0000
+#ifndef CONFIG_SYS_MEMTEST_SCRATCH
+# define CONFIG_SYS_MEMTEST_SCRATCH	0x10800000
+#endif
 
 #ifndef CONFIG_NR_DRAM_BANKS
 # define CONFIG_NR_DRAM_BANKS		2

include/configs/xilinx_zynqmp_mini.h

@@ -11,6 +11,8 @@
 #ifndef __CONFIG_ZYNQMP_MINI_H
 #define __CONFIG_ZYNQMP_MINI_H
 
+#define CONFIG_SYS_MEMTEST_SCRATCH     0xfffc0000
+
 #include <configs/xilinx_zynqmp.h>
 
 /* Undef unneeded configs */