drivers: dac: dacx0508: set explicitly init priority

Since this DAC is connected via SPI bus the init priority
value must be higher than the default 50 so it can be initialized
later than the bus itself so add a dedicated init config
symbol for that.

Signed-off-by: Bartosz Bilas <b.bilas@grinn-global.com>

drivers/dac/Kconfig.dacx0508

@@ -9,3 +9,13 @@ config DAC_DACX0508
 	depends on SPI
 	help
 	  Enable the driver for the TI DACx0508.
+
+if DAC_DACX0508
+
+config DAC_DACX0508_INIT_PRIORITY
+	int "Init priority"
+	default 80
+	help
+	  TI DACx0508 DAC device driver initialization priority.
+
+endif # DAC_DACX0508

drivers/dac/dac_dacx0508.c

@@ -385,7 +385,7 @@ static const struct dac_driver_api dacx0508_driver_api = {
 			    &dacx0508_init, NULL, \
 			    &dac##t##_data_##n, \
 			    &dac##t##_config_##n, POST_KERNEL, \
-			    CONFIG_DAC_INIT_PRIORITY, \
+			    CONFIG_DAC_DACX0508_INIT_PRIORITY, \
 			    &dacx0508_driver_api)
 
 /*