Enable double-buffered rendering to the display
Enable double-buffered rendering to the display

Turns out that the reason double-buffering was not working previously
was due to the usage of smbus_write_block_data and that it corrupts
the data it sends. Now that we're no longer using
smbus_write_block_data, the way that double-buffered rendering was
being attempted Just Works(TM).

tiziano88/scroll-phat-hd-rs,tiziano88/scroll-phat-hd-rs