PCI: amlogic: Fix probed clock names

Fix the clock names used in the probe function according
to the bindings.

Fixes: 9c0ef6d3

 ("PCI: amlogic: Add the Amlogic Meson PCIe controller driver")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Andrew Murray <andrew.murray@arm.com>