fs/ntfs3: Add ntfs_bitmap_weight_le function and refactoring

Added ntfs_bitmap_weight_le function.
Changed argument types of bits/bitmap functions.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

fs/ntfs3: Remove a useless shadowing variable

There is already a 'u8 mask' defined at the top of the function.
There is no need to define a new one here.

Remove the useless and shadowing new 'mask' variable.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Kari Argillander <kari.argillander@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

fs/ntfs3: Change right headers to bitfunc.c

We only need linux/types.h for types like u8 etc. So we can remove rest
and help compiler a little bit.

Signed-off-by: Kari Argillander <kari.argillander@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

fs/ntfs3: Restyle comments to better align with kernel-doc

Capitalize comments and end with period for better reading.

Also function comments are now little more kernel-doc style. This way we
can easily convert them to kernel-doc style if we want. Note that these
are not yet complete with this style. Example function comments start
with /* and in kernel-doc style they start /**.

Use imperative mood in function descriptions.

Change words like ntfs -> NTFS, linux -> Linux.

Use "we" not "I" when commenting code.

Signed-off-by: Kari Argillander <kari.argillander@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

fs/ntfs3: Add bitmap

This adds bitmap

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>