Use consistent search depth.

AndroidProducts.mk allows for a maxdepth of 4 in device and vendor while
vendorsetup.sh and BoardConfig.mk only allow for smaller depth.

Make search depth consistent for these files.

Change-Id: I406770c1423d4f27fe097956a7c705a0da937e35
Signed-off-by: Beare, Bruce J <bruce.j.beare@intel.com>
Signed-off-by: Laurent Fert <laurent.fert@intel.com>
Signed-off-by: Guilhem Imberton <guilhem.imberton@intel.com>
Author: Laurent Fert <laurent.fert@intel.com>