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Add adc control module for emulation board. The ADC converts the input voltage signal ranging from 0v to 3v into a 10-bit unsigned integer. Signed-off-by: Dino Li <dino.li@ite.com.tw> BRANCH=none BUG=none TEST=manual test. 1 - adc channel 1, 3, 5, and 7 to ground. 2 - adc channel 0 and 2 to 1.26v. 3 - adc channel 4 and 6 to 1.72v. 4 - condition, factor_mul = 3000, factor_div = 1024, and shift = 0. 5 - console "adc", result as following. adc_ch0 = 1256 adc_ch1 = 0 adc_ch2 = 1256 adc_ch3 = 0 adc_ch4 = 1722 adc_ch5 = 0 adc_ch6 = 1725 adc_ch7 = 0 Change-Id: I72efd09c9f7dbff25c4f6fd4846c9b1c1e5637ca Reviewed-on: https://chromium-review.googlesource.com/228092 Reviewed-by: Vincent Palatin <vpalatin@chromium.org> Commit-Queue: Dino Li <dino.li@ite.com.tw> Tested-by: Dino Li <dino.li@ite.com.tw>