[PATCH, AVR] Add support for new device: ATmega1284P

[Nick Clifton]

Hi Eric,

> /gas:
> 2007-11-14  Eric B. Weddington  <eric.weddington@atmel.com>
> 
> 	* config/tc-avr.c (mcu_types): Add ATmega1284P device.
> 	* doc/c-avr.texi: Likewise.

Approved - please apply.

Cheers
   Nick

PS.  How many of these devices are there ? :-)