samples: drivers: adc: Add variant for 8-bit resolution on nRF54x

sample:

  name: ADC driver sequence sample

tests:

  sample.drivers.adc.adc_sequence:

common:

  tags:

    - adc

  depends_on: adc

  harness: console

  timeout: 10

  harness_config:

    type: multi_line

    regex:

      - "ADC sequence reading \\[\\d+\\]:"

      - "- .+, channel \\d+, \\d+ sequence samples:"

      - "- - \\d+ (= \\d+mV)|(\\(value in mV not available\\))"

tests:

  sample.drivers.adc.adc_sequence:

    platform_allow:

      - cy8cproto_063_ble

      - cy8cproto_062_4343w

      - stm32f3_disco

    integration_platforms:

      - nrf52840dk/nrf52840

    harness: console

    timeout: 10

    harness_config:

      type: multi_line

      regex:

        - "ADC sequence reading \\[\\d+\\]:"

        - "- .+, channel \\d+, \\d+ sequence samples:"

        - "- - \\d+ (= \\d+mV)|(\\(value in mV not available\\))"

  sample.drivers.adc.adc_sequence.8bit:

    platform_allow:

      - nrf54l15dk/nrf54l15/cpuapp

      - nrf54h20dk/nrf54h20/cpuapp

    integration_platforms:

      - nrf54l15dk/nrf54l15/cpuapp

    extra_configs:

      - CONFIG_SEQUENCE_RESOLUTION=8