wcnss: Add interface to Reset wcnss

Add wcnss reset interface, this interface generates an FIQ to Riva.
Upon receiving this interrupt, Riva will execute the ERR_FATAL
routine and invoke SSR.

Change-Id: I74c293121cb69b312ed980902a12019adb700792
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>