drivers: adc: mcp320x: convert to spi_dt_spec
drivers: adc: mcp320x: convert to spi_dt_spec

Convert mcp320x driver to use `spi_dt_spec` helpers.

Signed-off-by: Bartosz Bilas <c9544010575ed4e48ae813e3d4bf273cb2e959c4@hotmail.com>

galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr