media: cxd2880-spi: Fix some error messages

Fix some erroneous function names in some error messages.
Remove some spurious or useless trailing and leading character in some
messages.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>