drivers: adc: esp32: split adc_esp32.c between 2 files

Splits driver source code between adc_esp32.c and adc_esp32_dma.c to
improve maintenance

Signed-off-by: Marcio Ribeiro <[email protected]>

Author: wmrsouza

drivers/adc/CMakeLists.txt

@@ -42,6 +42,7 @@ zephyr_library_sources_ifdef(CONFIG_ADC_ADS131M02		adc_ads131m02.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_RPI_PICO	adc_rpi_pico.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_XMC4XXX		adc_xmc4xxx.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_ESP32		adc_esp32.c)
+zephyr_library_sources_ifdef(CONFIG_ADC_ESP32_DMA	adc_esp32_dma.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_GECKO_ADC   	adc_gecko.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_GECKO_IADC   	iadc_gecko.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_SILABS_SIWX91X 	adc_silabs_siwx91x.c)