Log messages can be quite long so use a TextField rather than a char
field with max length of 240. mySQL is especially picky about field
lengths and will cause an exception if the log is too long.
[YOCTO #8475]
Signed-off-by: Michael Wood <michael.g.wood@intel.com> Signed-off-by: brian avery <avery.brian@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>