Add bitrev.h file to support rev8 and brev8 for riscv.

Changes in v2:
- Define generic __bitrev8/16/32 for reuse in riscv.

Jinjie Ruan (2):
  bitops: Define generic __bitrev8/16/32 for reuse
  arch/riscv: Add bitrev.h file to support rev8 and brev8

 arch/riscv/Kconfig                    |  1 +
 arch/riscv/include/asm/bitrev.h       | 41 +++++++++++++++++++++++++++
 include/asm-generic/bitops/__bitrev.h | 22 ++++++++++++++
 include/linux/bitrev.h                | 20 +++----------
 4 files changed, 68 insertions(+), 16 deletions(-)
 create mode 100644 arch/riscv/include/asm/bitrev.h
 create mode 100644 include/asm-generic/bitops/__bitrev.h

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2.34.1