1.when plc recv is finished , disable the soc irq t1 and t2 irq,
  and reeanble them when tx or rx data is processed
2.rm old uart, rename uart_my to uart

Signed-off-by: kevinhuhui <huhuikevin@gmail.com>
fix uart error

Signed-off-by: kevinhuhui <huhuikevin@gmail.com>