I recreated SSDT-PM. Script properly detected proc and built SSDT, but If I try to use it, processor stays at 800MHz, so I reenabled Delete Cpu0Ist and Delete CpuPm. One core is listed as 3.2 and other as 3.0 turbo and Intel power gadget shows 3.0 max and proper scaling. I'll settle with that.
Per Your advice, I used Clover to create SSDTs, but it created 21 file, including couple of DSDTs. I don't know what I need from all that, and with proper SSDTs and Open Core You shouldn't need DSDT at all, so I left in OC SSDTs (SSDT-EC.aml, SSDT-IMEI.aml, SSDT-PNLF.aml, SSDT-HPET.aml and SSDT-PLUG.aml)
I went with MacBookPro11,5 SMBIOS as newer models had some beachballing here and there (on authenticate dialogs for example).
Latitude e6420, i5-2520M,8GB RAM, SSD, OC 0.9.4, 10.13.6 High Sierra
Working:
IGPU with fully supported VDA decoder
USB
Sound (Speakers, headphones, HDMI)
HDMI
Wifi (Aetheros, slow, around 3-4 Mbps)
Ethernet
Bluetooth (oddly can't turn off, sometimes flakey)
Trackpad/Pointing stick
Function keys (volume, brightness, media...)
Sleep/wake
Not working:
SD Card reader
I'm attaching the EFI. Remember to change Serials if somebody decide to use this.
Best regards,
Goran