esoc: Add flexibility to avoid soft-reset during modem error fatal

In the event of a modem error-fatal, and if the related SSR is set,
the esoc driver takes the path of doing a warm reboot of the
device. However, modern design requires that the communication
link to the modem is not lost and the fact that the reboot is
done by SDI.

As a result, a flexibility is added such that the modem doesn't
have to go through the warm reboot sequence, thus preserving
the link.

Change-Id: Id78b877b33cdd501972c9b3274284a6b4c73f291
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>