defconfig: msm9625: Enable the modem subsystem restart driver

The pil-q6v5-mss driver monitors modem error interrupts
and restarts the modem in case the modem crashes. Enable
this driver for the 9625.

Change-Id: I62d1ba65876078907221cfffdea897231fbf0166
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>