Hello Musadjan,
See below,please!
1. IMX6SXIEC.pdf

2. About LCD interface
Below is from evk schematic

3. eLCDIF controller inside of CPU
GPU and eLCDIF controller are different IP, eLCDIF is used to display images on lcd screen, BUT GPU is used to accelerate 2D/3D graphics. If you just want to display simple image , not need 2D/3D acceleration. It is no problem to choose MCIMX6X1CVO08AC.
Hope the information is helpful to you.
Have a nice day!
B.R,
Weidong