arch/riscv: Rename `stages.c` to `romstage.c`

It's only used for romstage and is incompatible to ramstages. The latter
get `cbmem_top` passed as a third argument now.

Also drop comments that don't apply to this file anymore.

Change-Id: Ibabb022860f5d141ab35922f30e856da8473b529
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36611
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

0 files changed, 0 insertions, 0 deletions