Add support for ILI9340 to display_read_write test. This support was
verified with the adafruit_2_8_tft_touch_v2 shield.
Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
Add test for `display_read()` and `display_write()` api.
Note: The CI environment has no display device, which makes it fail
the tests. So, I make this test case `build_only`. But it can run in
a display device available environment.
Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>