libefivar: Replace BSD License with BSD+Patent License
Replace BSD 2-Clause License with BSD+Patent License. This change is
based on the following emails:
https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html
RFCs with detailed process for the license change:
V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html
Upstream Bug: https://bugzilla.tianocore.org/show_bug.cgi?id=1373
Obtained from: https://github.com/tianocore/edk2/commit/9344f0921518309295da89c221d10cbead8531aa
Pull Request: https://github.com/freebsd/freebsd-src/pull/581