Fix raster structure.

Change ref_clk and raster_clk from int to long, this allow to use this
structure even in 8bit microcontrollers where int is 16 bit long.
Fix debug information on mmc_sd interface.
Adapt 20x20MatrixLedUartSpiDma.c

This adapt 20x20MatrixLedUartSpiDma.c to the new structure of tDisplay
with raster_timings.
Adapt lcd_interface on 8 bit controllers.

Adapt lcd_interface on 8 bit controllers to new tDisplay structure.