soc: qcom: glink_probe: Move ssr assignment before registering

Assignment to ssr field of notifier block structure
is being done after registering notifier block. This can
result in calling ssr callback function even before ssr
field has valid assignment and result in NULL pointer
dereference.

Moving code for assignment to ssr field before registering
the ssr notifier block.

CRs-Fixed: 2414096
Change-Id: Ide0735b537ca02b0626e45f0aa0cb206dc21edef
Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>