btrfs: switch helper macros to static inlines in sysfs.h

The conversion macros use nested container_of that leads to a warning

fs/btrfs/sysfs.c: In function 'btrfs_feature_visible':
fs/btrfs/sysfs.c:183:8: warning: declaration of '__mptr' shadows a previous local
fs/btrfs/sysfs.c:183:8: warning: shadowed declaration is here

Use of functions will add proper type checking.

Signed-off-by: David Sterba <dsterba@suse.cz>