[Arm-netbook] tablet/laptop pcb rev3

[Luke Kenneth Casson Leighton]

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.