ARM: dts: msm: change CX handle for all PCIe nodes on msm8996

PCIe CX vote needs to be accounted for during both the active
and the sleep state of APPS. Change the CX handle for all
PCIe nodes so that their votes will not be ignored in the
sleep state.

Change-Id: If516737326f51368efa2116298e2d6089df99aa6
Signed-off-by: Tony Truong <truong@codeaurora.org>