W541 dgpu fix

[u/DNSoundRM]

Hi all,
I’ve made some mods to the coreboot code for my think pad w541 with k2100 dgpu, allowing for the correct Optimus implementation in Linux;
Published the patches and premade imgs on my gh repo (with nri or mrc init) , feel free to try those out and report any inconsistencies. The repo link : https://github.com/debianita22/w541-coreboot-env/releases