ARM: dts: davinci: da850-evm: Increase fifo threshold

When operating at low speeds, the display may throw an underflow
error and the display itself goes blank.  Increasing the fifo-th
value appears to correct this problem and the display can now
operate when the system is operating at speeds as low as 100MHz.

Signed-off-by: Adam Ford <aford173@gmail.com>
Link: https://lore.kernel.org/r/20250504102959.81830-1-aford173@gmail.com


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>