pci: switch: Add snapshot of PCIe switch driver

Add snapshot for switch driver stack from msm-4.14.c4 commit
ad8af976b4ab6 ("regulator: qpnp-lcdb: Disable step voltage ramp
for PM8150L V3").

Change-Id: I184823baa47f21c93e8bd6cc60c17fe790b92cfa
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>