tests: Add MAX78002EVKIT test overlay files

Enable following tests for MAX78002EVKIT:
 - tests/drivers/adc/adc_api
 - tests/drivers/counter/counter_basic_api
 - tests/drivers/dma/chan_blen_transfer
 - tests/drivers/dma/loop_transfer
 - tests/drivers/flash/common
 - tests/drivers/gpio/gpio_basic_api
 - tests/drivers/i2c/i2c_target_api
 - tests/drivers/pwm/pwm_api
 - tests/drivers/spi/spi_loopback
 - tests/drivers/w1/w1_api

Signed-off-by: Furkan Akkiz <hasanfurkan.akkiz@analog.com>