Add /lib/modules/modprobe.d to configuration search path

Add /lib/modules/modprobe.d to configuration search path

This commit adds additional tizen-specific /lib/modules/modprobe.d
to kmod search path to allow for packages providing modules to also
provide its configuration.

In Tizen kernel and modules images are build separately from "platform"
image, meaning only limited paths can be used (/lib/modules, /hal) for
its files to be accessible from the system.

Change-Id: I6985339abd1234aecfb5802484bd57f36a64bab2
Signed-off-by: Karol Lewandowski <k.lewandowsk@samsung.com>