fix some init issue on serial->open and serial->init
use FIFO when polling mode
use TCFIFO to check fifo status int drv_uart->putc
use TCFIFO to check fifo status int drv_uart->putc ,redefine MARCO for drv_uart in board.h ,clean up code comments.
clean up code TABs
Merge branch 'Polling_FIFO' into K60_INT
use FIFO when INT_TX