Employ a code spell checking tool to scan and correct spelling errors
in all files within the drivers/serial directory.
Signed-off-by: Pisit Sawangvonganan <pisit@ndrsolution.com>
When compiling the cadence uart, a warning is generated for the
zephyr/zephyr.h include. Fix it to be zephyr/kernel.h.
Signed-off-by: Ryan McClelland <ryanmcclelland@meta.com>