spl: introduce CONFIG_SPL_TARGET

Currently the SPL target is specified in a CPU-specific makefile
fragment.  While some targets may need something more complicated than a
simple target name, targets which don't need this shouldn't have to provide a makefile fragment just for this.

Signed-off-by: Scott Wood <scottwood@freescale.com>
---
v2: Removed default target as it's been pointed out to me how existing platforms
cause the SPL to be built.
diff --git a/Makefile b/Makefile
index f2882a1..5f8b02c 100644
--- a/Makefile
+++ b/Makefile
@@ -407,6 +407,7 @@
 ALL-$(CONFIG_NAND_U_BOOT) += $(obj)u-boot-nand.bin
 ALL-$(CONFIG_ONENAND_U_BOOT) += $(obj)u-boot-onenand.bin
 ALL-$(CONFIG_SPL) += $(obj)spl/u-boot-spl.bin
+ALL-$(CONFIG_SPL) += $(obj)$(subst ",,$(CONFIG_SPL_TARGET))
 ALL-$(CONFIG_OF_SEPARATE) += $(obj)u-boot.dtb $(obj)u-boot-dtb.bin
 
 # enable combined SPL/u-boot/dtb rules for tegra
diff --git a/README b/README
index 2dc0984..211bad0 100644
--- a/README
+++ b/README
@@ -2746,6 +2746,11 @@
 		CONFIG_SPL_LIBGENERIC_SUPPORT
 		Support for lib/libgeneric.o in SPL binary
 
+		CONFIG_SPL_TARGET
+		Final target image containing SPL and payload.  Some SPLs
+		use an arch-specific makefile fragment instead, for
+		example if more than one image needs to be produced.
+
 Modem Support:
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