samples: fat_fs: Build with adafruit_2_8_tft_touch_v2 shield
samples: fat_fs: Build with adafruit_2_8_tft_touch_v2 shield

Adds a new sample configuration to build the fat_fs sample with the
adafruit_2_8_tft_touch_v2 shield and SDMMC SPI driver in CI. It has been
tested with frdm_k64f and mimxrt685_evk_cm33 boards, but should work
with any board that supports Arduino SPI and Arduino GPIO features.

Signed-off-by: Maureen Helm <87a696db5547fa477bda9f9e0f00013c839c14d3@nxp.com>

finikorg/zephyr,finikorg/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,nashif/zephyr,galak/zephyr,nashif/zephyr,galak/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr