Avoids copies from being made, since the string is only ever used for
lookup, the data is never transfered anywhere.
Ideally, we'd use a std::string_view here, but devices is a
std::unordered_map, not a std::map, so we can't use heterogenous lookup
here.
NVFlinger will call into the nvdisp_disp0 device to perform screen flips, bypassing the ioctl interface.
We now have the address of the framebuffer to draw, we just need to actually put it on the screen.
