usb: xhci: xhci-plat: Add support for Broadcom STB SoC's

Add support for Broadcom STB SoC's to the xhci platform driver

Signed-off-by: Al Cooper <alcooperx@gmail.com>
Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20200512150019.25903-4-alcooperx@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>