selftest/wic: adding Testopia ID numbers to test cases missing it

selftest/wic: adding Testopia ID numbers to test cases missing it

The following test cases were assigned an ID number on Testopia:

1496 Test generation of .bmap file
1560 Test creation of systemd-bootdisk image
1561 Test creation of sdimage-bootpart image

(From OE-Core rev: b53e432206eaba7c6c67e4689c25b5e62d7ee9b2)

Signed-off-by: Jair Gonzalez <jair.de.jesus.gonzalez.plascencia@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>