wic: use 2 sysroots to find native executable

wic: use 2 sysroots to find native executable

Currently there is no way to specify a dependency on native
tools for wic without modifying wic-tools recipe. Obvious
way to make it more flexible is to use image sysroot and
wic-tools together to find an executable.

Modified run_native_cmd to use image and wic-tools sysroots
to find native executable.

[YOCTO #11017]

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