dt-bindings: phy: intel: Remove Thunder Bay eMMC PHY bindings

Remove Thunder Bay specific code as the product got cancelled
and there are no end customers or users.

Signed-off-by: A, Rashmi <rashmi.a@intel.com>
Reviewed-by: Hunter, Adrian <adrian.hunter@intel.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230316120549.21486-5-rashmi.a@intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>