ALSA: hda: cs35l41: fix building without CONFIG_SPI

When CONFIG_SPI is disabled, the driver produces unused-variable warning:

sound/pci/hda/cs35l41_hda_property.c: In function 'generic_dsd_config':
sound/pci/hda/cs35l41_hda_property.c:181:28: error: unused variable 'spi' [-Werror=unused-variable]
  181 |         struct spi_device *spi;
      |                            ^~~
sound/pci/hda/cs35l41_hda_property.c:180:27: error: unused variable 'cs_gpiod' [-Werror=unused-variable]
  180 |         struct gpio_desc *cs_gpiod;
      |                           ^~~~~~~~

Avoid these by turning the preprocessor contionals into equivalent C code,
which also helps readability.

Fixes: 916d0517 ("ALSA: hda: cs35l41: Only add SPI CS GPIO if SPI is enabled in kernel")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20240103102606.3742476-1-arnd@kernel.org


Signed-off-by: Takashi Iwai <tiwai@suse.de>