ARM: dts: msm: support the coexistence of 9x40 and mdmcalifornium

Add the support of PCIe endpoint mode for both 9x40 and
mdmcalifornium on the same kernel.

Change-Id: Id8f5c4d8bdf5862e20722b5d77541949f70f9743
Signed-off-by: Yan He <yanhe@codeaurora.org>