Fix a variety of typos in comments in target-arm files.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@petalogix.com>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>