Change the MMC to LPC1768/69
Created by: Daniel
Created by: henrique-silva
All controllers from the LPC176x family are pin-to-pin compatible, the difference is basically the amount of Flash and RAM ( 1764 -> 128K Flash, 32K RAM; 1768/69 -> 512K Flash, 64K RAM ). We also have the advantage that the LPC1768 is used in MBed boards, so they should be easier to purchase. With this extra Flash, we can improve the firmware upgrade mechanism on openMMC, having always a stable firmware copy and free space to download an update.