bootloader/atmel_start: change i2c addr pins to pullup

Signed-off-by: Adam Wujek <dev_public@wujek.eu>
3 jobs from adam-dev_clk in 45 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build Fw
passed #9568
arm-clang-coast
make_bootloader_fw

00:12

passed #9567
arm-clang-coast
make_main_fw

00:17

passed #9569
arm-clang-coast
make_test_master_fw

00:15