phy: samsung: phy-exynos-pcie: rework driver to support Exynos5433 PCIe PHY

Exynos5440 SoC support has been dropped since commit 8c83315d ("ARM:
dts: exynos: Remove Exynos5440"). Rework this driver to support PCIe PHY
variant found in the Exynos5433 SoCs.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
[mszyprow: reworked the driver to support only Exynos5433 variant, rebased
	   onto current kernel code, rewrote commit message]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Jingoo Han <jingoohan1@gmail.com>
Link: https://lore.kernel.org/r/20201120102627.14450-1-m.szyprowski@samsung.comSigned-off-by: Vinod Koul <vkoul@kernel.org>