dt-bindings: usb: rts5411: Rename property 'companion-hub' to 'peer-hub'

In the context of USB the term 'companion-hub' is misleading, change the
name of the property to 'peer-hub'.

There are no upstream users of the 'companion-hub' property, neither in
the device tree, nor on the driver side, so renaming it shouldn't cause
any compatibility issues with existing device trees.

Changes in v24:
- patch added to the series

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Link: https://lore.kernel.org/r/20220630123445.v24.2.Ie2bbbd3f690826404b8f1059d24edcab33ed898f@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>