msm: ep_pcie: support coexistence of MDM9x40 and mdmcalifornium

Add the support of PCIe endpoint mode for both MDM9x40 and
mdmcalifornium on the same kernel version.

Change-Id: I3534e4a9841cfa7a4fca3dcbb0518d336a7bf95c
Signed-off-by: Yan He <yanhe@codeaurora.org>