spl: add hierarchical defaults for SPL_LDSCRIPT

With SPL_LDSCRIPT moved to Kconfig (and this being a 'string' config
node), all the lingering definitions in header files will cause
warnings/errors due to the redefinition of the configuration item.

As we don't want to pollute the defconfig files (and values should
usually be identical for entire architectures), the defaults are moved
into Kconfig.  Kconfig will always pick the first default that
matches, so please keep these values at the end of each file (to allow
any board-specific Kconfig, which will be included earlier) to
override with an unconditional default setting.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 61d8d31..39b001f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -618,6 +618,11 @@
 	select SYS_FSL_SEC_LE
 	select SYS_THUMB_BUILD if SPL
 
+if ARCH_MX6
+config SPL_LDSCRIPT
+        default "arch/arm/mach-omap2/u-boot-spl.lds"
+endif
+
 config ARCH_MX5
 	bool "Freescale MX5"
 	select CPU_V7
@@ -1233,3 +1238,10 @@
 source "arch/arm/Kconfig.debug"
 
 endmenu
+
+config SPL_LDSCRIPT
+        default "arch/arm/cpu/arm926ejs/mxs/u-boot-spl.lds" if TARGET_APX4DEVKIT || TARGET_BG0900 || TARGET_M28EVK || TARGET_MX23_OLINUXINO || TARGET_MX23EVK || TARGET_MX28EVK || TARGET_SANSA_FUZE_PLUS || TARGET_SC_SPS_1 || TARGET_TS4600 || TARGET_XFI3
+        default "arch/arm/cpu/arm1136/u-boot-spl.lds" if CPU_ARM1136
+	default "arch/arm/cpu/armv8/u-boot-spl.lds" if ARM64
+
+