Added new parameter 'api' to sparse_copy function to specify
underlying filemap API to use. By default sparse_copy will
try both available APIs.
Added test case for sparse_copy to wic test suite.
(From OE-Core rev: 88701cef6ba399e82f96ed1b0eef9a44ed8c1687)
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>