esoc: Add support to retry the powerup of external modem

Due to recent hardware limitations, the requirement is to do
the warm reset of the modem twice. Once for collecting the
dumps and the other for transferring the firmware images.
If during the process, the driver receives a failed notification,
then power-off the modem. Hence, add code to support these
functionalities.

Change-Id: I4923b6e89474a44bdde477ccbd0c4e73b9648aae
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>