microblaze: drop remnants of manual reloc

Runtime relocation has been made the default for microblaze, so do the
following cleanups:
- drop all manual reloc codepaths in start.S
- drop all STATIC_RELA ifdefs, as it is now enabled unconditionally in
Kconfig

Reviewed-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Ovidiu Panait <ovpanait@gmail.com>
Link: https://lore.kernel.org/r/20230311173838.521804-5-ovpanait@gmail.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
3 files changed