wic: oe-selftest: build bmap-tools-native

wic: oe-selftest: build bmap-tools-native

bmap-tools-native is required to generate .bmap file. Without it
wic fails with this error when run with --bmap option:
    Error: A native program bmaptool required to build
           the image was not found

Added bmap-tools-native to the list of requirements to build
in Wic.setUpLocal method.

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>