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/freescale/common/Makefile b/board/freescale/common/Makefile
index b4faf6f..c491dc8 100644
--- a/board/freescale/common/Makefile
+++ b/board/freescale/common/Makefile
@@ -5,7 +5,7 @@
 
 MINIMAL=
 
-ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_XPL_BUILD
 ifndef CONFIG_TPL_BUILD
 ifdef CONFIG_SPL_INIT_MINIMAL
 MINIMAL=y
@@ -29,14 +29,14 @@
 obj-$(CONFIG_FSL_CADMUS)	+= cadmus.o
 obj-$(CONFIG_FSL_VIA)		+= cds_via.o
 obj-$(CONFIG_FMAN_ENET)	+= fman.o
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 obj-$(CONFIG_FSL_NGPIXIS)	+= ngpixis.o
 endif
 obj-$(I2C_COMMON)		+= i2c_common.o
 obj-$(CONFIG_FSL_USE_PCA9547_MUX)		+= i2c_mux.o
 obj-$(CONFIG_$(SPL_)VID)	+= vid.o
 obj-$(CONFIG_FSL_QIXIS)	+= qixis.o
-ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_XPL_BUILD
 obj-$(CONFIG_ID_EEPROM)	+= sys_eeprom.o
 endif
 ifndef CONFIG_RAMBOOT_PBL