Make osk-sdl fast on the PinePhone!

Now for !1557 (closed) for master

TODO:

• document new deviceinfo variable
• document procedure with strace osk-sdl to find xorg/modules for device
• test on pinephone
• test on fp2?
• fix https://gitlab.com/postmarketOS/osk-sdl/-/issues/103 (missing frame when typing quickly)

closed