classes/create-spdx-2.2: Handle SemVer License List Versions

classes/create-spdx-2.2: Handle SemVer License List Versions

SPDX transitioned the license list to use SemVer visioning, (e.g.
"MAJOR.MINOR.MICRO"), but SPDX 2 only allows "MAJOR.MINOR". For maximum
compatibility, only keep the first two version numbers and discard the
rest which allows it to work with either scheme

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>