[roll] Roll fuchsia [bazel_migration][kernel] //zircon/kernel/lib/smbios

Also migrated in this change:
- //zircon/kernel/lib/cxxabi-dynamic-init
- //zircon/kernel/phys/test/elf-loading

Migrate C++ library and header targets in //zircon/kernel/lib/smbios,
//zircon/kernel/lib/cxxabi-dynamic-init, and
//zircon/kernel/phys/test/elf-loading from GN to Bazel.

- Convert `headers` and `smbios` in `//zircon/kernel/lib/smbios` to
  `BUILD.bazel`, keeping test groups in `BUILD.gn`.
- Convert `headers` and `cxxabi-dynamic-init` in
  `//zircon/kernel/lib/cxxabi-dynamic-init` to `BUILD.bazel`, keeping
  test groups in `BUILD.gn`.
- Convert `get-int.source` in `//zircon/kernel/phys/test/elf-loading`
  to `BUILD.bazel`, keeping `zbi_executable`, `kernel_elf_interp`,
  `kernel_package`, `get_int`, `zbi_test`, and `group("elf-loading")`
  in `BUILD.gn`.
- Sync migrated targets back to `BUILD.gn` via `bazel2gn` for
  remaining GN consumers.

Bazel-Migration-Target: //zircon/kernel/lib/cxxabi-dynamic-init:cxxabi-dynamic-init
Bazel-Migration-Target: //zircon/kernel/lib/cxxabi-dynamic-init:headers
Bazel-Migration-Target: //zircon/kernel/lib/smbios:headers
Bazel-Migration-Target: //zircon/kernel/lib/smbios:smbios
Bazel-Migration-Target: //zircon/kernel/phys/test/elf-loading:get-int.source
Test: fx bazel build --config=fuchsia_platform @//zircon/kernel/lib/smbios:smbios
Test: fx bazel build --config=fuchsia_platform @//zircon/kernel/lib/cxxabi-dynamic-init:cxxabi-dynamic-init
Test: fx bazel build --config=fuchsia_platform @//zircon/kernel/phys/test/elf-loading:get-int.source
TAG: planter planter-20261104-3710f23a05c
Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1947592
Risk: Fuchsia CL Risk (Advisory) <groupagent-fuchsia-risk@google.com>
Original-Original-Revision: 71ac2eff7ba92560a8f37e7a0d0d716de8562258
GitOrigin-RevId: 4f8b0fa076f96ded627450048e8b53a3d8d08802
Change-Id: I2f6c249e3b55cd798834bbdc0f77924227d8c6ed
Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1948465
Cr-Commit-Position: refs/heads/main@{#210915}