icnss: Fix uninitialized variable

As part of optimization in msa permissions assignment
source and destination vmids are introduced as uninitialized
arrays.
The fix is for initialization of the array as zero initially
so that variables doesnot have the garbage value from the stack.

Change-Id: Ie30d61f3be9ed5a5a2cef2e63348d987e894c22a
CRs-fixed: 2096940
Signed-off-by: Anurag Chouhan <achouhan@codeaurora.org>