forked from Mirrors/opensbi

Split up sbi_ecall_replace so that each extension is in its individual file. Also reorganize the corresponding section in lib/sbi/objects.mk so that it is grouped by extension, now that the object file targets are split up. Signed-off-by: Vivian Wang <dramforever@live.com> Reviewed-by: Anup Patel <anup@brainfault.org>