ARM: dts: msm: Add the support of 2 PCIe RCs on APQ8084

Add a node for PCIe Root Complex (RC) 1 on APQ8084 and update RC0
as well.

Change-Id: I1d21467cf736f71711e932b32674a299528fe7f5
Signed-off-by: Yan He <yanhe@codeaurora.org>