clk: qcom: gcc-sdxpoorwills: add additional USB/PCIe clocks

Add missing PCIE and USB30 clocks to the list of supported
GCC clocks in sdxpoowrills.

Signed-off-by: Osvaldo Banuelos <osvaldob@codeaurora.org>
Change-Id: I9bab0b46bb60a2a44639b9f4d891647b9527c5ec