When using rootless X, /usr/sbin is not in PATH and thus running "fbset"
will fail; so specify /usr/sbin/fbset instead.
Fixes [YOCTO #1986]
(From OE-Core rev: fb2df75e1552e60c67449c06cd80accc40ea534e)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>