drivers: adc: Adding Infineon HPPASS ADC tests

Adding files to allow running the following tests for the Infineon
HPPASS SAR ADC driver on the PSOC C3 family of MCUs:
  * tests/drivers/adc/adc_api
  * tests/drivers/adc/adc_error_case
Modifies the adc_error_cases test to use add a KConfig option
for the valid resolution.

Signed-off-by: John Batch <john.batch@infineon.com>
4 files changed