This stabilizes USB support. The old patch was handling initialization
in a different order that was causing some problems with few USB 3.0
devices. Some weren't detected, some were working unstable, sometimes
USB 3.0 could hang the whole controller.

A still known issue (but not a regression) is controller hang triggered
by connecting USB 1.1 device when not having OHCI controller enabled
(kmod-usb-ohci).
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

Backport of r45997

git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@45998 3c298f89-4303-0410-b956-a3cf2f4a3e73