esoc: Avoid setting up soft reset gpio if using SPMI

If SPMI property is set in device tree, avoid setting up
the soft toggle gpio so that it can be configured for other
purposes.

Change-Id: I07ab1be6a826a754678f9b3f2651c8a697a6575d
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>