meta-oe: Fix erroneous use of "startline" in LIC_FILES_CHKSUM

"beginline" is the correct parameter name. Checksums have been updated
where necessary (i.e. if the beginning line was something other than the
default of 1).

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>