riscv, bpf: Fix RV32 broken build, and silence RV64 warning

Commit 252c765bd764 ("riscv, bpf: Add BPF exception tables") only addressed
RV64, and broke the RV32 build [1]. Fix by gating the exception tables code
with CONFIG_ARCH_RV64I.

Further, silence a "-Wmissing-prototypes" warning [2] in the RV64 BPF JIT.

  [1] https://lore.kernel.org/llvm/[email protected]/
  [2] https://lore.kernel.org/llvm/[email protected]/

Fixes: 252c765bd764 ("riscv, bpf: Add BPF exception tables")
Signed-off-by: Björn Töpel <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Reviewed-by: Tong Tiangen <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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