msm: pcie: add PCIe device ID for MDM9640

PCIe device ID varies depending on the chipset.
Missing PCIe device ID for MDM9640; therefore, add
it to PCIe bus driver. By doing so, PCIe can
register for system suspend and resume.

Change-Id: I18f1156cbba3ce257e0e330689810e143a7576ff
Signed-off-by: Tony Truong <truong@codeaurora.org>