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docker: Allow clang-android to target riscv

Nathan Chancellorrequested to merge
nathanchance/tuxmake:clang-android-riscv into master

Android's clang has supported RISC-V since at least clang-r468909b:

  $ prebuilts-trunk/clang/host/linux-x86/clang-r468909b/bin/clang -print-targets
    Registered Targets:
      aarch64    - AArch64 (little endian)
      aarch64_32 - AArch64 (little endian ILP32)
      aarch64_be - AArch64 (big endian)
      arm        - ARM
      arm64      - ARM64 (little endian)
      arm64_32   - ARM64 (little endian ILP32)
      armeb      - ARM (big endian)
      bpf        - BPF (host endian)
      bpfeb      - BPF (big endian)
      bpfel      - BPF (little endian)
      riscv32    - 32-bit RISC-V
      riscv64    - 64-bit RISC-V
      thumb      - Thumb
      thumbeb    - Thumb (big endian)
      x86        - 32-bit X86: Pentium-Pro and above
      x86-64     - 64-bit X86: EM64T and AMD64

In order to facilitate building Android's RISC-V gki_defconfig in kernel/common, allow targeting riscv with clang-android.

Meta comment: We hit this while testing with tuxsuite. If there is something else that needs to be done for tuxsuite after this, please let me know what that is.

cc @nickdesaulniers

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