perf tools: Support MIPS unwinding and dwarf-regs

Map perf APIs (perf_reg_name/get_arch_regstr/unwind__arch_reg_id) with
MIPS specific registers.

[[email protected]: repick this patch for unwinding userstack backtrace
by perf and libunwind on MIPS based CPU.]

[[email protected]: Add sample_reg_masks[] to fix build error,
silence some checkpatch errors and warnings, and also separate the
original patches into two parts (MIPS kernel and perf tools) to merge
easily.]

The original patches:

https://lore.kernel.org/patchwork/patch/1126521/
https://lore.kernel.org/patchwork/patch/1126520/

Committer notes:

Do it as __perf_reg_name() to cope with:

  067012974c8ae31a ("perf tools: Fix arm64 build error with gcc-11")

Signed-off-by: Tiezhu Yang <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Archer Yan <[email protected]>
Cc: David Daney <[email protected]>
Cc: Jianlin Lv <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Juxin Gao <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Xuefeng Li <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: [email protected]
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Archer Yan <[email protected]>
Signed-off-by: David Daney <[email protected]>
Signed-off-by: Ralf Baechle <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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