phy: phy-qcom-apq8064-sata: convert to readl_relaxed_poll_timeout()

Use readl_relaxed_poll_timeout() to simplify code, rename local function
read_poll_timeout() as poll_timeout() to avoid repeated definition

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1598320987-25518-4-git-send-email-chunfeng.yun@mediatek.com


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