drivers: display: st7789v: Add multi-instance support
drivers: display: st7789v: Add multi-instance support

Replace the config and data struct with a macro. Execute the macro
for each instance.

Signed-off-by: Casper Meijn <ef7830db5bfbf3536820c00105ab5734ef4609fc@meijn.net>

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