spi: fix some invalid char occurrences

One of the author names got an invalid char, probably due to
a bad charset conversion, being replaced by the
REPLACEMENT CHARACTER U+fffd ('�').

Use the author's e-mail has the characters without accents,
as also used at the .mailmap file.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/ff8d296e1fdcc4f1c6df94434a5720bcedcd0ecf.1621412009.git.mchehab+huawei@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>