tests: drivers: i2c_api: Convert to use DEVICE_DT_GET

This PR is related to #47464, missing the fix of device_get_binding
in the test_burst_gy271 function.

Move to use DEVICE_DT_GET instead of device_get_binding as
we work on phasing out use of DTS 'label' property.

Signed-off-by: Tim Lin <tim2.lin@ite.corp-partner.google.com>