global: Rename SPL_ to XPL_

Use XPL_ as the symbol to indicate an SPL build. This means that SPL_ is
no-longer set.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index a87e6a6..ebac347 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -16,7 +16,7 @@
 obj-y += board.o board2.o
 obj-y += cache.o
 obj-$(CONFIG_TEGRA_CLKRST) += clock.o
-obj-$(CONFIG_$(SPL_)TEGRA_CRYPTO) += crypto.o
+obj-$(CONFIG_$(XPL_)TEGRA_CRYPTO) += crypto.o
 obj-$(CONFIG_TEGRA_PMC) += powergate.o
 obj-y += xusb-padctl-dummy.o
 
diff --git a/arch/arm/mach-tegra/tegra20/Makefile b/arch/arm/mach-tegra/tegra20/Makefile
index 2774c86..32c1866 100644
--- a/arch/arm/mach-tegra/tegra20/Makefile
+++ b/arch/arm/mach-tegra/tegra20/Makefile
@@ -3,7 +3,7 @@
 # (C) Copyright 2010,2011 Nvidia Corporation.
 
 obj-$(CONFIG_XPL_BUILD) += cpu.o
-obj-$(CONFIG_$(SPL_)CMD_EBTUPDATE) += bct.o
+obj-$(CONFIG_$(XPL_)CMD_EBTUPDATE) += bct.o
 
 # The AVP is ARMv4T architecture so we must use special compiler
 # flags for any startup files it might use.
diff --git a/arch/arm/mach-tegra/tegra30/Makefile b/arch/arm/mach-tegra/tegra30/Makefile
index 5edc7c9..b36657a 100644
--- a/arch/arm/mach-tegra/tegra30/Makefile
+++ b/arch/arm/mach-tegra/tegra30/Makefile
@@ -3,6 +3,6 @@
 # Copyright (c) 2010-2012, NVIDIA CORPORATION.  All rights reserved.
 
 obj-$(CONFIG_XPL_BUILD) += cpu.o
-obj-$(CONFIG_$(SPL_)CMD_EBTUPDATE) += bct.o
+obj-$(CONFIG_$(XPL_)CMD_EBTUPDATE) += bct.o
 
 obj-y	+= clock.o