x86/boot: Remove superfluous type casting from arch/x86/boot/bitops.h

'const void *' will auto-type-convert to just about any other const
pointer type, no need to force it.

  [ mingo: Rewrote the changelog. ]

Signed-off-by: Li kunyu <kunyu@nfschina.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220725042358.3377-1-kunyu@nfschina.com