The binding states the reset GPIO property shall be named
"cirrus,gpio-nreset" and this is what the driver looks for,
but the example uses "gpio-reset". Fix this here.

Fixes: 3bb40619 ("ASoC: cs42l56: bindings: sound: Add bindings for CS42L56 CODEC")
Signed-off-by: NAndrew F. Davis <afd@ti.com>
Signed-off-by: NMark Brown <broonie@kernel.org>