imx-gpu-viv: Fix host user contamination in package
The copy of contents must not use the host user when copying the
contents for packaging. This fixes following QA errors as:
,----
| WARNING: QA Issue:
| .../packages-split/imx-gpu-viv-tools/usr/bin/gmem_info is owned by uid
| 1000, which is the same as the user running bitbake. This may be due
| to host contamination [host-user-contaminated]
`----
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
