pyramid: display: Define lcd.v_back_porch etc.

Needed to boot on some AUO panels. Thanks to ivanich for discovering this.
pyramid: display: Fix artifacts/screen jumping due to vsync

This fixes the jumping when lcd.v_back_porch is defined as something greater than 0.

Signed-off-by: Sultanxda <sultanxda@gmail.com>
pyramid: display: Clean up

Signed-off-by: Sultanxda <sultanxda@gmail.com>
pyramid: display: Update bus bandwidth from CM

Signed-off-by: Sultanxda <sultanxda@gmail.com>