main_fw/ADC: support different sets of channel mappings

Fantray has different ADC channel assignments comparing to previous designs.

Signed-off-by: Adam Wujek <dev_public@wujek.eu>
5 jobs from adam-dev in 1 minute and 15 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build Fw
passed #10030
arm-clang-coast
make_bootloader_fw

00:12

failed #10028
arm-clang-coast
make_main_fw_fant

00:13

passed #10029
arm-clang-coast
make_main_fw_rato

00:17

passed #10027
arm-clang-coast
make_main_fw_rtsb

00:17

passed #10031
arm-clang-coast
make_test_master_fw

00:13