ASoC: soc-ac97: cleanup cppcheck warning

ASoC: soc-ac97: cleanup cppcheck warning

This patch cleanups below cppcheck warning.

sound/soc/soc-ac97.c:41:15: style: struct member 'snd_ac97_gpio_priv::gpios_set' is never used. [unusedStructMember]
 unsigned int gpios_set;
              ^
sound/soc/soc-ac97.c:42:28: style: struct member 'snd_ac97_gpio_priv::component' is never used. [unusedStructMember]
 struct snd_soc_component *component;
                           ^

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87r1euyolk.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>