arm: dts: msm: add PCIe core preset for qcs405, sa6155, and sa8155

PCIe trace on QCS405, SA6155, and SA8155 are long and require
more aggressive equalization setting. Add the recommended PCIe
core preset setting for each of these chips.

Change-Id: I813f85473a2806d2017e1402e475dd533e9842a2
Signed-off-by: Tony Truong <truong@codeaurora.org>