msm: pcie: add support to distingush between PCIe PHY ver

PCIe bus driver can now use devicetree to help distingush
which PCIe QMP PHY version is being used. This will allow
PCIe bus driver to choose the correct PCIe PHY sequence.

Change-Id: I74c67431b75292bb1db3e4b97d89d69de9b6f11b
Signed-off-by: Tony Truong <truong@codeaurora.org>