clk: qcom: Add snapshot of virtio clock driver

Add snapshot of virtio clock driver from msm-4.14.
This snapshot is taken as of msm-4.14 commit 703333543986
("clk: qcom: Add pcie1 virtio clocks for sa8155").

Change-Id: I73f7480e28bd7d5401e0b2293aad6c28dc25964c
Signed-off-by: Zhiqiang Tu <ztu@codeaurora.org>