ARM: dts: msm: Enable reset via PM_RESIN_N for mdm9650 PCIe EP TTP

Enable PMIC stage 2 reset for mdm9650 PCIe EP TTP when the
reset line is held low for 2 seconds. This is used by the
PCIe RC host to force reset the MDM if it crashes or becomes
unresponsive.

Change-Id: Ifdfab79cb6441d332305e6dd7e83bede2f500940
Signed-off-by: Gustavo Solaira <gustavos@codeaurora.org>