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/MPC8349ITX_LOWBOOT_defconfig b/configs/MPC8349ITX_LOWBOOT_defconfig
index c95cec6..19d818f 100644
--- a/configs/MPC8349ITX_LOWBOOT_defconfig
+++ b/configs/MPC8349ITX_LOWBOOT_defconfig
@@ -1,9 +1,10 @@
 CONFIG_PPC=y
+CONFIG_SYS_TEXT_BASE=0xFE000000
 CONFIG_MPC83xx=y
 CONFIG_TARGET_MPC8349ITX=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
-CONFIG_SYS_EXTRA_OPTIONS="MPC8349ITX,SYS_TEXT_BASE=0xFE000000"
+CONFIG_SYS_EXTRA_OPTIONS="MPC8349ITX"
 CONFIG_BOOTDELAY=6
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="root=/dev/nfs rw nfsroot=:/nfsroot/rootfs ip=::::mpc8349emitx:eth0:off console=ttyS0,115200"