tty: serial: extract tx_ready() from __serial_lpc32xx_tx()

The condition in __serial_lpc32xx_tx()'s loop is barely readable.
Extract it to a separate function. This will make the cleanup in the
next patches easier too.

Cc: Vladimir Zapolskiy <[email protected]>
Cc: <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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