dm: adc: add simple ADC uclass implementation

This commit adds:
- new uclass id: UCLASS_ADC
- new uclass driver: drivers/adc/adc-uclass.c

The new uclass's API allows for ADC operation on:
* single-channel with channel selection by a number
* multti-channel with channel selection by bit mask

ADC uclass's functions:
* single-channel:
  - adc_start_channel()        - start channel conversion
  - adc_channel_data()         - get conversion data
  - adc_channel_single_shot()  - start/get conversion data
* multi-channel:
  - adc_start_channels()       - start selected channels conversion
  - adc_channels_data()        - get conversion data
  - adc_channels_single_shot() - start/get conversion data for channels
                                 selected by bit mask
* general:
  - adc_stop()      - stop the conversion
  - adc_vdd_value() - positive reference Voltage value with polarity [uV]
  - adc_vss_value() - negative reference Voltage value with polarity [uV]
  - adc_data_mask() - conversion data bit mask

The device tree can provide below constraints/properties:
- vdd-polarity-negative: if true: Vdd = vdd-microvolts * (-1)
- vss-polarity-negative: if true: Vss = vss-microvolts * (-1)
- vdd-supply:            phandle to Vdd regulator's node
- vss-supply:            phandle to Vss regulator's node
And optional, checked only if the above corresponding, doesn't exist:
  - vdd-microvolts:      positive reference Voltage [uV]
  - vss-microvolts:      negative reference Voltage [uV]

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/drivers/adc/Kconfig b/drivers/adc/Kconfig
new file mode 100644
index 0000000..b6e226a
--- /dev/null
+++ b/drivers/adc/Kconfig
@@ -0,0 +1,12 @@
+config ADC
+	bool "Enable ADC drivers using Driver Model"
+	help
+	  This enables ADC API for drivers, which allows driving ADC features
+	  by single and multi-channel methods for:
+	  - start/stop/get data for conversion of a single-channel selected by
+	    a number or multi-channels selected by a bitmask
+	  - get data mask (ADC resolution)
+	  ADC reference Voltage supply options:
+	  - methods for get Vdd/Vss reference Voltage values with polarity
+	  - support supply's phandle with auto-enable
+	  - supply polarity setting in fdt