drivers/usb: Adding a new ehci halt function

New halt function that doesn't use spinlocks to be called during startup
to just halt the EHCI controller

Signed-off-by: SangeethaRao <sangeetha.rao@lsi.com>
powerpc/dts: corrected USB entries to ACP3421 DTS

Signed-off-by: SangeethaRao <sangeetha.rao@lsi.com>
drivers/usb: incorrect ehci_regs struct member was being used

Signed-off-by: SangeethaRao <sangeetha.rao@lsi.com>
powerpc/sysdev: Added PCIe driver support for ACP35xx

Signed-off-by: SangeethaRao <sangeetha.rao@lsi.com>