Build LVGL for Raspberry Pi PICO

I did these changes on lv_micropython but I didnt have the intention to upload, I mean, I didnt have in mind create something “robust”, cause I had no experience with cmake.
I used the esp32 work as a reference and these commits where made by… Embeddedt? Uraich? Amigron? I dont remember. So to retain lvgl coherence between ports I recomend to ask these users to review (maybe you aready did)

I hope the review will happen as a part of the respective PRs discussion. Your (much appreciated) changes are now minimized by being applied on the top of master. It would be a shame for it to rot in the forum. So let’s hope it gets through :slight_smile: