PCI: qcom: Add missing ipq806x clocks in PCIe driver

PCI: qcom: Add missing ipq806x clocks in PCIe driver

Aux and Ref clk are missing in PCIe qcom driver. Add support for this
optional clks for ipq8064/apq8064 SoC.

Link: https://lore.kernel.org/r/20200615210608.21469-2-ansuelsmth@gmail.com
Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver")
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>