poly1305-p10le: use '.rodata' section for read-only data
* cipher/poly1305-p10le.s: Change '.data' section to '.rodata'.
Cherry-pick master commit of:
0c2d120e1124ee491712bbf93329c50a5b4d287f
- GnuPG-bug-id: T7721
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>