gbadisplay: add simple driver for the GameBoy Advance display #620
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This only implements the 15 bits per pixel mode, not any of the other possible display modes. This matches conventional SPI displays most closely. Future additions might add more display modes.
Normally I'd argue interfacing with chip/board specific hardware should be done in the machine package using a generic interface, but the GBA is kind of special and I don't want the machine package to depend on the tinygo.org/x/drivers/pixel package.