Adds board configurations to support the mimxrt1050_evk and
mimxrt1060_evk boards in the lvgl sample.
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
Fixes the lvgl sample to use the same display device name as the lvgl
library rather than a hardcoded string.
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>