spl: moveconfig: remove SPL_LDSCRIPT definitions for header-files

With the hierarchical defaults set up, we remove these from the header
files.  To do so, I've run moveconfig on SPL_LDSCRIPT and this commits
the changes.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>