tools headers: Sync linux/bits.h with the kernel source

To pick up the changes in this cset:

  104ea1c8 bits: unify the non-asm GENMASK*()
  6d447125 bits: split the definition of the asm and non-asm GENMASK*()

This addresses these perf build warnings:

  Warning: Kernel ABI header differences:
    diff -u tools/include/linux/bits.h include/linux/bits.h

Please see tools/include/uapi/README for further details.

Cc: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>