Using the 4.14 Linux kernel from GitHub - Freescale/linux-fslc at 4.14.x+fslc I get the following issue
open("/dev/galcore", O_RDWR) = -1 ENOENT (No such file or directory)
open("/dev/graphics/galcore", O_RDWR) = -1 ENOENT (No such file or directory)
A little digging about suggests that this is related to the mxc driver present in the latest BSP from NXP which is for 4.9. When is the BSP for Linux kernel 4.14 expected to be released?