board: Use CONFIG_XPL_BUILD instead of CONFIG_SPL_BUILD

Use the new symbol to refer to any 'SPL' build, including TPL and VPL

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/xilinx/microblaze-generic/microblaze-generic.c b/board/xilinx/microblaze-generic/microblaze-generic.c
index 2b035d5..dc45238 100644
--- a/board/xilinx/microblaze-generic/microblaze-generic.c
+++ b/board/xilinx/microblaze-generic/microblaze-generic.c
@@ -40,7 +40,7 @@
 	ulong max_size;
 	u32 status = 0;
 
-#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_SYSRESET_MICROBLAZE)
+#if !defined(CONFIG_XPL_BUILD) && defined(CONFIG_SYSRESET_MICROBLAZE)
 	int ret;
 
 	ret = device_bind_driver(gd->dm_root, "mb_soft_reset",