dt-bindings: phy: Add YAML schemas for Intel ComboPhy

ComboPhy subsystem provides PHY support to various
controllers, viz. PCIe, SATA and EMAC.
Adding YAML schemas for the same.

Signed-off-by: Dilip Kota <eswara.kota@linux.intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-By: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/e8cc2038f8fe417ddf8c3298eebae722ee5d8fe2.1589868358.git.eswara.kota@linux.intel.com


Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>