serial: 8250: Fix typos in comments across various files

This patch fixes several typos in the comments within the tty/8250
directory to improve readability and code documentation.

Detected using codespell.

Signed-off-by: Yu Jiaoliang <yujiaoliang@vivo.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240929100931.530620-1-yujiaoliang@vivo.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>