drivers/pipe: Change to the block mode by file_ioctl(FIONBIO)

[xiaoxiang781216]

Summary

it's simpler and safer than file_fcntl(F_SETFL)

Impact

code refactor only

Testing

internal test

[acassis]

@xiaoxiang781216 did you try it: https://acassis.wordpress.com/2021/03/04/using-fifo-on-nuttx-to-send-data-from-your-board-to-computer/ ?

[xiaoxiang781216]

@xiaoxiang781216 did you try it: https://acassis.wordpress.com/2021/03/04/using-fifo-on-nuttx-to-send-data-from-your-board-to-computer/ ?

not try, but we use pipe in many places, so the test coverage is good.