boards: shield: adafruit_2_8_tft_touch_v2: add support for RD_RW612_BGA

Add support for the RD RW612 BGA board for the adafruit_2_8_tft_touch_v2
shield. This board uses a custom LCDIC MIPI DBI controller, which
requires a specific board overlay to enable the shield.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>