MFC r360013, r360018, r360021

r360013:
arm: Fix duplicate ehci DRIVER_MODULE

Name each ehci driver uniquely.
This remove the warning printed at each arm boot :
module_register: cannot register simplebus/ehci from kernel; already loaded from kernel

A similar fix was done in r333074 but imx_ehci wasn't renamed and generic_ehci wasn't
present at that time.

r360018:
arm: Fix duplicate pcib DRIVER_MODULE

Name each pcib driver uniquely.
This remove the warning printed at each arm boot :
module_register: cannot register simplebus/pcib from kernel; already loaded from kernel

r360021:
arm: nvidia: pcie: Rename class name to pcib

Reported by: jhb