usb: host: xhci-plat: add support for the R-Car H2 and M2 xHCI controllers

usb: host: xhci-plat: add support for the R-Car H2 and M2 xHCI controllers

The R-Car H2 and M2 SoCs come with an xHCI controller that requires
some specific initializations related to the firmware downloading and
some specific registers. This patch adds the support for this special
configuration as an xHCI quirk executed during probe and start.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: "mathias.nyman@intel.com" <mathias.nyman@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 4ac8918f3a737c21d81e250e4194c12ea2b7eb04)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>