When there is no device connected to the controller we should not start
the controller. This also changes between PCIe 1.0 and PCIe 2.0 speed
based on the device. This code is based on code from the new Broadcom
PCIe controller driver.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43748 3c298f89-4303-0410-b956-a3cf2f4a3e73