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-imx/imx8m/clock_imx8mq.c b/arch/arm/mach-imx/imx8m/clock_imx8mq.c
index 43e677d..2f53430 100644
--- a/arch/arm/mach-imx/imx8m/clock_imx8mq.c
+++ b/arch/arm/mach-imx/imx8m/clock_imx8mq.c
@@ -611,7 +611,7 @@
 			     CLK_ROOT_PRE_DIV(CLK_ROOT_PRE_DIV5));
 }
 
-#ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_XPL_BUILD
 void dram_pll_init(ulong pll_val)
 {
 	u32 val;
@@ -791,7 +791,7 @@
 /*
  * Dump some clockes.
  */
-#ifndef CONFIG_SPL_BUILD
+#ifndef CONFIG_XPL_BUILD
 static int do_imx8m_showclocks(struct cmd_tbl *cmdtp, int flag, int argc,
 			       char *const argv[])
 {