soc: qcom: Reset PDC along with RSC in modem shutdown

In case there is a PDC which works with the subsystem
RSC, then in modem shutdown path, PDC also needs to be
reset when the subsystem restart register is reset.

Change-Id: Iea28f9c49af0eb90dfd454302972c0cbbb822c50
Signed-off-by: Jitendra Sharma <shajit@codeaurora.org>