Update dac drivers to use DT_HAS_<compat>_ENABLED Kconfig symbol
to expose the driver and enable it by default based on devicetree.
We remove 'depend on' Kconfig for symbols that would be implied by
the devicetree node existing.
Signed-off-by: Martin Jäger <martin@libre.solar>
Since this DAC is connected via I2C 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>
MCP4728 is a 12-bit, Quad Digital-to-Analog Converter with EEPROM Memory.
Controlled via I2C interface.
Signed-off-by: Marek Janus <marek.janus@grinn-global.com>
