Slim_ngd: Don't create the device node per SSR

Observe the device crash due to the device node
gets created per ADSP SSR when the logical address
query succeeds at the first attempt.
This patch makes sure that the device node creation
happened only once  by declaring another variable to
track the logical address retry.

CRs-Fixed: 640381
Change-Id: I3d947fcbc575af7cb431255772aa9cb64d2df6b6
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>