update AT91SAM9260 usart driver， using serial driver component.
update at91sam9260 project directory structure.
commit again
fix compiling error
Embedded GPLv2 license.
Merge pull request #133 from weety/at91sam9260

At91sam9260
add mount table
simulator: update to support simulator for linux
Merge pull request #134 from prife/sim-fix

simulator: update to support simulator for linux
add initialization debug code
Merge branch 'master' of https://github.com/RT-Thread/rt-thread