CHROMIUM: arm64: mt8186: dts: Use legacy XHCI nodes

The upstream version of DTS introduced the split between
XHCI and SSUSB devices. That is causing issues with
system suspend.

Use legacy device description for now until the problem
is solved in mainline.

BUG=b:351926349
TEST=powerd_dbus_suspend
UPSTREAM-TASK=b:362203280

Change-Id: I8bef712857a4c29d4b09c9970a57a34ea87f0ff3
Signed-off-by: Wojciech Macek <wmacek@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5841997


Reviewed-by: Łukasz Majczak <lmajczak@google.com>
Commit-Queue: Łukasz Majczak <lmajczak@google.com>
Signed-off-by: Mateusz Urbańczyk <urbanczyk@google.com>