Add bindings to describe Mediatek MT7621 PCIe PHY.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201121155037.21354-2-sergio.paracuellos@gmail.comSigned-off-by: Vinod Koul <vkoul@kernel.org>