configs: Migrate CONFIG_SYS_TEXT_BASE

On the NIOS2 and Xtensa architectures, we do not have
CONFIG_SYS_TEXT_BASE set.  This is a strict migration of the current
values into the defconfig and removing them from the headers.

I did not attempt to add more default values in and for now will leave
that to maintainers.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/snow_defconfig b/configs/snow_defconfig
index 72fd8c2..ddb7605 100644
--- a/configs/snow_defconfig
+++ b/configs/snow_defconfig
@@ -2,6 +2,7 @@
 # CONFIG_SPL_USE_ARCH_MEMCPY is not set
 # CONFIG_SPL_USE_ARCH_MEMSET is not set
 CONFIG_ARCH_EXYNOS=y
+CONFIG_SYS_TEXT_BASE=0x43E00000
 CONFIG_ARCH_EXYNOS5=y
 CONFIG_TARGET_SNOW=y
 CONFIG_IDENT_STRING=" for snow"