It is now created during Service initialization and passed to all the services that need it.

* Fixes some cast warnings, partially fixes citra #3064

* Converted casts to uint32_t to u32

* Ran clang-format

Prevents implicit conversions.

Previously this would unnecessarily zero-initialize the vector before
copying the actual data into the vector instance.

NV: Move the nvdrv classes into the Nvidia namespace, and move the functionality to a s single module that services call.

This prevents missing frames if the vblank fires between the DequeueBuffer and Wait(vsync) calls

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.

Don't try to draw buffers that the guest application is using, only queued buffers are eligible for drawing.

Drawing actual pixels is still not implemented.

The homebrew display test application now properly writes graphics data to the graphics buffer but we still don't have a way to compose the display layers.