phy: uniphier-pcie: Set VCOPLL clamp mode in PHY register

Set VCOPLL clamp mode to mode 0 to avoid hardware unstable issue.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/1635503947-18250-6-git-send-email-hayashi.kunihiko@socionext.com


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