wic: use truncate utility to create sparse files

Used truncate instead of dd to create wic images for the
following reasons:
 - dd doesn't preserve sparseness
 - truncate syntax is much more clear
 - dd requires additional calculations of the image size
   in blocks
 - the way dd was used in the code is not always correct.
   In some cases it was writing one block to the file which makes
   it not 100% sparse.

[YOCTO #9099]

(From OE-Core rev: d2d0d18dfd3922411d856b98ab6ba5d64c9c1c9f)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions