i.MX is a DT-only platform, so of_match_ptr() can be safely
removed.

Remove the unneeded of_match_ptr().
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20210328183034.555702-1-festevam@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>