ARM: dts: msm: Disable PCIe l0s low power mode for QCS405

With some PCIe endpoints, link down interrupt is being triggered on RC
side after endpoint enumeration if l0s is enabled. As workaround,
suggestion is to disable l0s low power mode. Hence disable l0s low power
mode for QCS405 to avoid PCIe link down issue.

Change-Id: I6e52bd8c5afa824f2d88fda29069fb56fddf8043
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>