[PATCH, AVR] Add support for new AVR device ATtiny88

[Nick Clifton]

Hi Eric,

> /gas:
> 2007-11-08  Eric B. Weddington  <eweddington@cso.atmel.com>
> 
> 	* config/tc-avr.c (mcu_types): Add ATtiny88 device.
> 	* doc/c-avr.texi: Likewise.

Approved, please apply.

Cheers
   Nick