Remove the following obsolete macros:

- BCD2BIN
- BIN2BCD
- BCD_TO_BIN
- BIN_TO_BCD
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>