microblaze: Guard do_reset by CONFIG_SYSRESET

sysreset uclass have own do_reset function which should be used instead
of board/platform specific.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/xilinx/microblaze-generic/microblaze-generic.c b/board/xilinx/microblaze-generic/microblaze-generic.c
index 58ca1d7..889695f 100644
--- a/board/xilinx/microblaze-generic/microblaze-generic.c
+++ b/board/xilinx/microblaze-generic/microblaze-generic.c
@@ -58,6 +58,7 @@
 	return 0;
 };
 
+#if !defined(CONFIG_SYSRESET) || defined(CONFIG_SPL_BUILD)
 int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 #ifndef CONFIG_SPL_BUILD
@@ -76,6 +77,7 @@
 
 	return 0;
 }
+#endif
 
 static int gpio_init(void)
 {