perf riscv: Remove dwarf-regs.c and add dwarf-regs-table.h

The file just provides the function get_arch_regstr, however, if in
the only caller get_dwarf_regstr EM_HOST is used for the EM_NONE case,
and the register table is provided in a header file, the function can
never be called. So remove as dead code. Tidy up the EM_NONE cases for
riscv in dwarf-regs.c.

Reviewed-by: Masami Hiramatsu (Google) <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Palmer Dabbelt <[email protected]>
Cc: Anup Patel <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Shenlin Liang <[email protected]>
Cc: Nick Terrell <[email protected]>
Cc: Guilherme Amadio <[email protected]>
Cc: Steinar H. Gunderson <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Alexander Lobakin <[email protected]>
Cc: Przemek Kitszel <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: James Clark <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Chen Pei <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Oliver Upton <[email protected]>
Cc: Aditya Gupta <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Bibo Mao <[email protected]>
Cc: John Garry <[email protected]>
Cc: Atish Patra <[email protected]>
Cc: Dima Kogan <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Dr. David Alan Gilbert <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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