dt-bindings: phy: samsung: drop old Eynos5440 PCIe phy

dt-bindings: phy: samsung: drop old Eynos5440 PCIe phy

The Exynos5440 PCIe phy support was removed in commit 496db029142f
("phy: samsung: phy-exynos-pcie: rework driver to support Exynos5433
PCIe PHY") (with its own bindings), so drop the old bindings.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220129193646.372481-2-krzysztof.kozlowski@canonical.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>