MLK-13776 ocotp: Add fuse word checking before programming it on i.MX7ULP

MLK-13776 ocotp: Add fuse word checking before programming it on i.MX7ULP

On i.MX7ULP, the fuse words (except bank 0 and 1) only supports to write once,
because they use ECC mode. Multiple writes may damage the ECC value and cause a
wrong fuse value decoded when reading.
This patch adds a checking before the fuse word programming, only can write
when the word value is 0.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit e8447d649a631ec98120d84fab124ca29fbe39f0)