armv8: Support not having separate BSS

Separate BSS is current mandatory on armv8 but this is not useful for
early boot phases. Add support for the combined BSS.

Use an #ifdef to avoid using CONFIG_SPL_BSS_START_ADDR which is not
valid in this case.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
1 file changed