ASoC: rt5575: fix SPI dependency

The rt5575 driver fails to link when SPI support is in a loadable
module but the codec is built-in:

x86_64-linux-ld: vmlinux.o: in function `rt5575_i2c_probe':
rt5575.c:(.text+0x9792ce): undefined reference to `rt5575_spi_get_device'
rt5575.c:(.text+0x979332): undefined reference to `rt5575_spi_fw_load'

Change the symbol in to a 'bool' and add a dependency that rules
out the broken configuration.

Fixes: 4207391 ("ASoC: rt5575: Add the codec driver for the ALC5575")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20260202095432.1234133-1-arnd@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: arndb

sound/soc/codecs/Kconfig

@@ -1801,9 +1801,10 @@ config SND_SOC_RT5575
 	depends on I2C
 
 config SND_SOC_RT5575_SPI
-	tristate "Realtek ALC5575 Codec - SPI"
+	bool "Realtek ALC5575 Codec - SPI"
 	depends on SPI_MASTER && I2C
 	depends on SND_SOC_RT5575
+	depends on SPI_MASTER=y || SND_SOC_RT5575=m
 
 config SND_SOC_RT5616
 	tristate "Realtek RT5616 CODEC"