A new common module is created. It implements all functions
that have no device specificity (PCI, Platform).

This patch only consists in move (no functional changes)
Signed-off-by: NKim Phillips <kim.phillips@linaro.org>
Signed-off-by: NEric Auger <eric.auger@linaro.org>
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>