[Arm-netbook] tablet/laptop pcb rev3

ok opportunity with the cpu card interface redesign to do a layout change, i'm taking out the atsam4s and replacing it with a VC0345 camera IC, PCA9536 I2C-to-GPIO converter, and am putting in a Micro-SD on the top edge of the PCB (so that things like the IC1T card can use it). ethernet and the extra USB i will route to an FPC which can go to a daughterboard for when this is used in a mini laptop. USB audio remains as-is using the CM108AH.

basically the tablet pcb becomes a usb / i2c peripheral board, something i didn't want to do because i wanted the educational and experimentation sector covered as well.

l.