u-boot-{pinephone,librem5}: fix build
Fix the build for current Alpine edge and 3.21, which has a newer SWIG version.
Patch is based on: https://github.com/dgibson/dtc/pull/154
Fix the build for current Alpine edge and 3.21, which has a newer SWIG version.
Patch is based on: https://github.com/dgibson/dtc/pull/154