sysroot: add prebuilt-module-dir option for ubuntu sysroot
sysroot: add prebuilt-module-dir option for ubuntu sysroot

This patch adds "prebuilt-module-dir" option for ubuntu sysroot.
It is used for prebuilt package with deb file.

Change-Id: If09f199ef94ee76299b2dc6c6a54504add12c7d1
Signed-off-by: Sowon Na <7ed402a04f2fdc9693a203092231aea9e041664b@samsung.com>

SamsungARTIK/build-artik