ASoC: loongson: add PCI dependency

The new driver fails to build when PCI is disabled:

WARNING: unmet direct dependencies detected for SND_SOC_LOONGSON_I2S_PCI
  Depends on [n]: SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] && (LOONGARCH || COMPILE_TEST [=y]) && PCI [=n]
  Selected by [y]:
  - SND_SOC_LOONGSON_CARD [=y] && SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] && (LOONGARCH || COMPILE_TEST [=y])
sound/soc/loongson/loongson_i2s_pci.c:167:1: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
module_pci_driver(loongson_i2s_driver);

Add the appropriate Kconfig dependency.

Fixes: d240286 ("ASoC: loongson: Add Loongson ASoC Sound Card Support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20230616090156.2347850-3-arnd@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/loongson/Kconfig

@@ -16,6 +16,7 @@ config SND_SOC_LOONGSON_I2S_PCI
 config SND_SOC_LOONGSON_CARD
 	tristate "Loongson Sound Card Driver"
 	select SND_SOC_LOONGSON_I2S_PCI
+	depends on PCI
 	help
 	  Say Y or M if you want to add support for SoC audio using
 	  loongson I2S controller.