ext4: remove EXT4_MB_{BITMAP,BUDDY} macros

The EXT4_MB_BITMAP and EXT4_MB_BUDDY macros obfuscate more than they
provide any abstraction.   So remove them.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --cc fs/ext4/mballoc.c
Simple merge

diff --cc fs/ext4/mballoc.h
Simple merge