spi: microchip-core: Simplify some error message

dev_err_probe() already prints the error code in a human readable way, so
there is no need to duplicate it as a numerical value at the end of the
message.

Moreover, in the case of devm_clk_get() it would only display '0' because
'ret' is know to be 0 at this point.

Fixes: cdeaf3a9 ("spi: microchip-core: switch to use dev_err_probe()")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/fb894ecec68e03fb7fc9353027c8b1a2610833d7.1659735153.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Mark Brown <broonie@kernel.org>