boards: arm: mimxrt595_evk_cm33: configure LVGL for improved performance

Configure LVGL to improve performance on the RT595 EVK, with the
following changes:

- Allocate two rendering buffers for LVGL, both the entire size of the
  display
- Force LVGL full refresh bit
- Locate LVGL rendering buffers in external PSRAM (since they will not
  fit on onboard SRAM)

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