Remove call to depmod in busybox

The version of depmod in busybox does not work if two versions of
the same kernel version are available, as search paths are not
honoured correctly.  However, we don't need to actually call
depmod as it's done during image building anyway.

Change-Id: Idd3cd5854e7c86e7ca1f2b0e50758d7db79ab6e7
Co-Author: matthew.gilliard@hp.com
Closes-bug: #1302856
Merge "Remove call to depmod in busybox"