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/strider_con_defconfig b/configs/strider_con_defconfig
index f4ee434..4c460ef 100644
--- a/configs/strider_con_defconfig
+++ b/configs/strider_con_defconfig
@@ -1,4 +1,5 @@
 CONFIG_PPC=y
+CONFIG_SYS_TEXT_BASE=0xFE000000
 CONFIG_IDENT_STRING=" strider con 0.01"
 CONFIG_MPC83xx=y
 CONFIG_TARGET_STRIDER=y