Add MKS 12864 OLED pins to SGEN-L#16188

thinkyhead merged 4 commits intoMarlinFirmware:bugfix-2.0.xMarlinFirmware/Marlin:bugfix-2.0.xfrom

thisiskeithb:pr/sgen-l-mks_12864_oled_pinsthisiskeithb/Marlin:pr/sgen-l-mks_12864_oled_pinsCopy head branch name to clipboard