The flatten_real_mode routine is not needed until after decompressing
.text16.early, and currently performs various contortions to
compensate for the fact that .prefix may not be writable. Move
flatten_real_mode to .text16.early to save on (compressed) binary size
and simplify the code.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
d931d4bd9c