arch: 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/arch/arm/mach-k3/security.c b/arch/arm/mach-k3/security.c
index 7c46914..3468a37 100644
--- a/arch/arm/mach-k3/security.c
+++ b/arch/arm/mach-k3/security.c
@@ -126,7 +126,7 @@
 	 * via YMODEM. This is done to avoid disturbing the YMODEM serial
 	 * protocol transactions.
 	 */
-	if (!(IS_ENABLED(CONFIG_SPL_BUILD) &&
+	if (!(IS_ENABLED(CONFIG_XPL_BUILD) &&
 	      IS_ENABLED(CONFIG_SPL_YMODEM_SUPPORT) &&
 	      spl_boot_device() == BOOT_DEVICE_UART))
 		printf("Authentication passed\n");