For those with old system that have "Previous Generation HD Graphics," this might be of interest to you. I am just starting to install Mojave 10.14.1 on an old Socket 1156 Motherboard with I5-660 CPU. I created a Mojave Installer USB and installed CLOVER Bootloader (Legacy) 4741. I extracted my DSDT (CLOVER F4) and performed minimal DSDT edits (to resolve compile errors) and basic DSDT patches. Mojave Installer recognized the Previous Gen Intel graphics without any additional kexts and without any special CLOVER config.plist graphics options. I plan to purchase a Radeon graphics card for this system, but for now, the old HD Graphics are functional at 1280x1024 resolution.